diff --git a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments.cy.ts b/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments.cy.ts
index fc48008af83f7..12173369c896b 100644
--- a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments.cy.ts
+++ b/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments.cy.ts
@@ -5,7 +5,7 @@
  * 2.0.
  */
 
-import { ROLES } from '@kbn/security-solution-plugin/common/test';
+import { visitWithTimeRange } from '../../../../../tasks/navigation';
 import { getNewRule } from '../../../../../objects/rule';
 import {
   closeAlertFlyout,
@@ -17,13 +17,11 @@ import {
 } from '../../../../../tasks/alerts';
 import { createRule } from '../../../../../tasks/api_calls/rules';
 import { deleteAlertsAndRules } from '../../../../../tasks/api_calls/common';
-import { login } from '../../../../../tasks/login';
+import { getDefaultUserName, login } from '../../../../../tasks/login';
 import { ALERTS_URL } from '../../../../../urls/navigation';
 import { waitForAlertsToPopulate } from '../../../../../tasks/create_new_rule';
 import {
   alertDetailsFlyoutShowsAssignees,
-  alertDetailsFlyoutShowsAssigneesBadge,
-  alertsTableShowsAssigneesBadgeForFirstAlert,
   alertsTableShowsAssigneesForAlert,
   updateAssigneesForFirstAlert,
   checkEmptyAssigneesStateInAlertDetailsFlyout,
@@ -38,23 +36,12 @@ import {
   updateAssigneesViaAddButtonInFlyout,
   updateAssigneesViaTakeActionButtonInFlyout,
   removeAllAssigneesViaTakeActionButtonInFlyout,
-  loadPageAs,
 } from '../../../../../tasks/alert_assignments';
 import { ALERTS_COUNT } from '../../../../../screens/alerts';
 
-// FLAKY: https://github.com/elastic/kibana/issues/173429
-// FLAKY: https://github.com/elastic/kibana/issues/177334
-describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@serverless'] }, () => {
+describe('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@serverless'] }, () => {
   before(() => {
     cy.task('esArchiverLoad', { archiveName: 'auditbeat_multiple' });
-
-    // Login into accounts so that they got activated and visible in user profiles list
-    login(ROLES.t1_analyst);
-    login(ROLES.t2_analyst);
-    login(ROLES.t3_analyst);
-    login(ROLES.soc_manager);
-    login(ROLES.detections_admin);
-    login(ROLES.platform_engineer);
   });
 
   after(() => {
@@ -62,59 +49,36 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
   });
 
   beforeEach(() => {
-    loadPageAs(ALERTS_URL);
+    login();
     deleteAlertsAndRules();
     createRule(getNewRule({ rule_id: 'new custom rule' }));
+    visitWithTimeRange(ALERTS_URL);
     waitForAlertsToPopulate();
   });
 
   context('Basic rendering', () => {
-    it('alert with no assignees in alerts table', () => {
+    it('alert with no assignees in alerts table & details flyout', () => {
       checkEmptyAssigneesStateInAlertsTable();
-    });
 
-    it(`alert with no assignees in alert's details flyout`, () => {
       expandFirstAlert();
       checkEmptyAssigneesStateInAlertDetailsFlyout();
     });
 
-    it('alert with some assignees in alerts table', () => {
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
+    it('alert with some assignees in alerts table & details flyout', () => {
+      const users = [getDefaultUserName()];
       updateAssigneesForFirstAlert(users);
+
       alertsTableShowsAssigneesForAlert(users);
-    });
 
-    it(`alert with some assignees in alert's details flyout`, () => {
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
-      updateAssigneesForFirstAlert(users);
       expandFirstAlert();
       alertDetailsFlyoutShowsAssignees(users);
     });
-
-    it('alert with many assignees (collapsed into badge) in alerts table', () => {
-      const users = [
-        ROLES.t1_analyst,
-        ROLES.t2_analyst,
-        ROLES.t3_analyst,
-        ROLES.soc_manager,
-        ROLES.detections_admin,
-      ];
-      updateAssigneesForFirstAlert(users);
-      alertsTableShowsAssigneesBadgeForFirstAlert(users);
-    });
-
-    it(`alert with many assignees (collapsed into badge) in alert's details flyout`, () => {
-      const users = [ROLES.detections_admin, ROLES.t1_analyst, ROLES.t2_analyst];
-      updateAssigneesForFirstAlert(users);
-      expandFirstAlert();
-      alertDetailsFlyoutShowsAssigneesBadge(users);
-    });
   });
 
   context('Updating assignees (single alert)', () => {
     it('adding new assignees via `More actions` in alerts table', () => {
       // Assign users
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
+      const users = [getDefaultUserName()];
       updateAssigneesForFirstAlert(users);
 
       // Assignees should appear in the alerts table
@@ -129,7 +93,7 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       expandFirstAlert();
 
       // Assign users
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
+      const users = [getDefaultUserName()];
       updateAssigneesViaAddButtonInFlyout(users);
 
       // Assignees should appear in the alert's details flyout
@@ -144,7 +108,7 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       expandFirstAlert();
 
       // Assign users
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
+      const users = [getDefaultUserName()];
       updateAssigneesViaTakeActionButtonInFlyout(users);
 
       // Assignees should appear in the alert's details flyout
@@ -155,73 +119,9 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       alertsTableShowsAssigneesForAlert(users);
     });
 
-    it('updating assignees via `More actions` in alerts table', () => {
-      // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
-      updateAssigneesForFirstAlert(initialAssignees);
-      alertsTableShowsAssigneesForAlert(initialAssignees);
-
-      // Update assignees
-      const updatedAssignees = [ROLES.t1_analyst, ROLES.t2_analyst];
-      updateAssigneesForFirstAlert(updatedAssignees);
-
-      const expectedAssignees = [ROLES.detections_admin, ROLES.t2_analyst];
-
-      // Expected assignees should appear in the alerts table
-      alertsTableShowsAssigneesForAlert(expectedAssignees);
-
-      // Expected assignees should appear in the alert's details flyout
-      expandFirstAlert();
-      alertDetailsFlyoutShowsAssignees(expectedAssignees);
-    });
-
-    it('updating assignees via add button in flyout', () => {
-      expandFirstAlert();
-
-      // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
-      updateAssigneesViaAddButtonInFlyout(initialAssignees);
-      alertDetailsFlyoutShowsAssignees(initialAssignees);
-
-      // Update assignees
-      const updatedAssignees = [ROLES.t1_analyst, ROLES.t2_analyst];
-      updateAssigneesViaAddButtonInFlyout(updatedAssignees);
-
-      const expectedAssignees = [ROLES.detections_admin, ROLES.t2_analyst];
-
-      // Expected assignees should appear in the alert's details flyout
-      alertDetailsFlyoutShowsAssignees(expectedAssignees);
-
-      // Expected assignees should appear in the alerts table
-      closeAlertFlyout();
-      alertsTableShowsAssigneesForAlert(expectedAssignees);
-    });
-
-    it('updating assignees via `Take action` button in flyout', () => {
-      expandFirstAlert();
-
-      // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
-      updateAssigneesViaTakeActionButtonInFlyout(initialAssignees);
-      alertDetailsFlyoutShowsAssignees(initialAssignees);
-
-      // Update assignees
-      const updatedAssignees = [ROLES.t1_analyst, ROLES.t2_analyst];
-      updateAssigneesViaTakeActionButtonInFlyout(updatedAssignees);
-
-      const expectedAssignees = [ROLES.detections_admin, ROLES.t2_analyst];
-
-      // Expected assignees should appear in the alert's details flyout
-      alertDetailsFlyoutShowsAssignees(expectedAssignees);
-
-      // Expected assignees should appear in the alerts table
-      closeAlertFlyout();
-      alertsTableShowsAssigneesForAlert(expectedAssignees);
-    });
-
     it('removing all assignees via `More actions` in alerts table', () => {
       // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
+      const initialAssignees = [getDefaultUserName()];
       updateAssigneesForFirstAlert(initialAssignees);
       alertsTableShowsAssigneesForAlert(initialAssignees);
 
@@ -237,7 +137,7 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       expandFirstAlert();
 
       // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
+      const initialAssignees = [getDefaultUserName()];
       updateAssigneesViaTakeActionButtonInFlyout(initialAssignees);
       alertDetailsFlyoutShowsAssignees(initialAssignees);
 
@@ -251,41 +151,22 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
   });
 
   context('Updating assignees (bulk actions)', () => {
-    it('adding new assignees should be reflected in UI (alerts table and details flyout)', () => {
+    it('adding new assignees should be reflected in UI (alerts table)', () => {
       selectFirstPageAlerts();
 
       // Assign users
-      const users = [ROLES.detections_admin, ROLES.t1_analyst];
+      const users = [getDefaultUserName()];
       bulkUpdateAssignees(users);
 
       // Assignees should appear in the alerts table
       alertsTableShowsAssigneesForAllAlerts(users);
     });
 
-    it('updating assignees should be reflected in UI (alerts table and details flyout)', () => {
+    it('removing all assignees should be reflected in UI (alerts table)', () => {
       selectFirstPageAlerts();
 
       // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
-      bulkUpdateAssignees(initialAssignees);
-      alertsTableShowsAssigneesForAllAlerts(initialAssignees);
-
-      // Update assignees
-      selectFirstPageAlerts();
-      const updatedAssignees = [ROLES.t1_analyst, ROLES.t2_analyst];
-      bulkUpdateAssignees(updatedAssignees);
-
-      const expectedAssignees = [ROLES.detections_admin, ROLES.t2_analyst];
-
-      // Expected assignees should appear in the alerts table
-      alertsTableShowsAssigneesForAllAlerts(expectedAssignees);
-    });
-
-    it('removing all assignees should be reflected in UI (alerts table and details flyout)', () => {
-      selectFirstPageAlerts();
-
-      // Initially assigned users
-      const initialAssignees = [ROLES.detections_admin, ROLES.t1_analyst];
+      const initialAssignees = [getDefaultUserName()];
       bulkUpdateAssignees(initialAssignees);
       alertsTableShowsAssigneesForAllAlerts(initialAssignees);
 
@@ -303,7 +184,7 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       const totalNumberOfAlerts = 5;
       const numberOfSelectedAlerts = 2;
       selectNumberOfAlerts(numberOfSelectedAlerts);
-      bulkUpdateAssignees([ROLES.t1_analyst]);
+      bulkUpdateAssignees([getDefaultUserName()]);
 
       filterByAssignees([NO_ASSIGNEES]);
 
@@ -314,41 +195,20 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
     it('by one assignee', () => {
       const numberOfSelectedAlerts = 2;
       selectNumberOfAlerts(numberOfSelectedAlerts);
-      bulkUpdateAssignees([ROLES.t1_analyst]);
+      bulkUpdateAssignees([getDefaultUserName()]);
 
-      filterByAssignees([ROLES.t1_analyst]);
+      filterByAssignees([getDefaultUserName()]);
 
       cy.get(ALERTS_COUNT).contains(numberOfSelectedAlerts);
     });
 
-    it('by multiple assignees', () => {
-      const numberOfSelectedAlerts1 = 1;
-      selectNumberOfAlerts(numberOfSelectedAlerts1);
-      bulkUpdateAssignees([ROLES.t1_analyst]);
-
-      filterByAssignees([NO_ASSIGNEES]);
-
-      const numberOfSelectedAlerts2 = 2;
-      selectNumberOfAlerts(numberOfSelectedAlerts2);
-      bulkUpdateAssignees([ROLES.detections_admin]);
-
-      clearAssigneesFilter();
-
-      cy.get(ALERTS_COUNT).contains(5);
-
-      filterByAssignees([ROLES.t1_analyst, ROLES.detections_admin]);
-
-      const expectedNumberOfAlerts = numberOfSelectedAlerts1 + numberOfSelectedAlerts2;
-      cy.get(ALERTS_COUNT).contains(expectedNumberOfAlerts);
-    });
-
     it('by assignee and alert status', () => {
       const totalNumberOfAlerts = 5;
       const numberOfAssignedAlerts = 3;
       selectNumberOfAlerts(numberOfAssignedAlerts);
-      bulkUpdateAssignees([ROLES.t1_analyst]);
+      bulkUpdateAssignees([getDefaultUserName()]);
 
-      filterByAssignees([ROLES.t1_analyst]);
+      filterByAssignees([getDefaultUserName()]);
 
       const numberOfClosedAlerts = 1;
       selectNumberOfAlerts(numberOfClosedAlerts);
@@ -362,7 +222,7 @@ describe.skip('Alert user assignment - ESS & Serverless', { tags: ['@ess', '@ser
       const expectedNumberOfAllerts2 = totalNumberOfAlerts - numberOfClosedAlerts;
       cy.get(ALERTS_COUNT).contains(expectedNumberOfAllerts2);
 
-      filterByAssignees([ROLES.t1_analyst]);
+      filterByAssignees([getDefaultUserName()]);
       selectPageFilterValue(0, 'closed');
       cy.get(ALERTS_COUNT).contains(numberOfClosedAlerts);
     });
diff --git a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_complete.cy.ts b/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_complete.cy.ts
deleted file mode 100644
index 2d245384ed670..0000000000000
--- a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_complete.cy.ts
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { ROLES } from '@kbn/security-solution-plugin/common/test';
-import { getNewRule } from '../../../../../objects/rule';
-import { refreshAlertPageFilter, selectFirstPageAlerts } from '../../../../../tasks/alerts';
-import { createRule } from '../../../../../tasks/api_calls/rules';
-import { deleteAlertsAndRules } from '../../../../../tasks/api_calls/common';
-import { login } from '../../../../../tasks/login';
-import { ALERTS_URL } from '../../../../../urls/navigation';
-import { waitForAlertsToPopulate } from '../../../../../tasks/create_new_rule';
-import {
-  alertsTableShowsAssigneesForAlert,
-  updateAssigneesForFirstAlert,
-  bulkRemoveAllAssignees,
-  loadPageAs,
-} from '../../../../../tasks/alert_assignments';
-
-// Failing: See https://github.com/elastic/kibana/issues/177573
-describe.skip(
-  'Alert user assignment - Serverless Complete',
-  {
-    tags: ['@serverless'],
-    env: {
-      ftrConfig: {
-        productTypes: [
-          { product_line: 'security', product_tier: 'complete' },
-          { product_line: 'endpoint', product_tier: 'complete' },
-        ],
-      },
-    },
-  },
-  () => {
-    before(() => {
-      cy.task('esArchiverLoad', { archiveName: 'auditbeat_multiple' });
-
-      // Login into accounts so that they got activated and visible in user profiles list
-      login(ROLES.t1_analyst);
-      login(ROLES.t2_analyst);
-      login(ROLES.t3_analyst);
-      login(ROLES.soc_manager);
-      login(ROLES.detections_admin);
-      login(ROLES.platform_engineer);
-    });
-
-    after(() => {
-      cy.task('esArchiverUnload', 'auditbeat_multiple');
-    });
-
-    beforeEach(() => {
-      loadPageAs(ALERTS_URL);
-      deleteAlertsAndRules();
-      createRule(getNewRule({ rule_id: 'new custom rule' }));
-      waitForAlertsToPopulate();
-    });
-
-    context('Authorization / RBAC', () => {
-      it('users with editing privileges should be able to update assignees', () => {
-        const editors = [
-          ROLES.t1_analyst,
-          ROLES.t2_analyst,
-          ROLES.t3_analyst,
-          ROLES.rule_author,
-          ROLES.soc_manager,
-          ROLES.detections_admin,
-          ROLES.platform_engineer,
-        ];
-        editors.forEach((role) => {
-          loadPageAs(ALERTS_URL, role);
-          waitForAlertsToPopulate();
-
-          // Unassign alert
-          selectFirstPageAlerts();
-          bulkRemoveAllAssignees();
-          refreshAlertPageFilter();
-
-          updateAssigneesForFirstAlert([role]);
-
-          // Assignees should appear in the alerts table
-          alertsTableShowsAssigneesForAlert([role]);
-        });
-      });
-    });
-  }
-);
diff --git a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_essentials.cy.ts b/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_essentials.cy.ts
deleted file mode 100644
index 0405fb7dc5976..0000000000000
--- a/x-pack/test/security_solution_cypress/cypress/e2e/detection_response/detection_engine/detection_alerts/assignments/assignments_serverless_essentials.cy.ts
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { ROLES } from '@kbn/security-solution-plugin/common/test';
-import { getNewRule } from '../../../../../objects/rule';
-import { refreshAlertPageFilter, selectFirstPageAlerts } from '../../../../../tasks/alerts';
-import { createRule } from '../../../../../tasks/api_calls/rules';
-import { deleteAlertsAndRules } from '../../../../../tasks/api_calls/common';
-import { login } from '../../../../../tasks/login';
-import { ALERTS_URL } from '../../../../../urls/navigation';
-import { waitForAlertsToPopulate } from '../../../../../tasks/create_new_rule';
-import {
-  alertsTableShowsAssigneesForAlert,
-  updateAssigneesForFirstAlert,
-  bulkRemoveAllAssignees,
-  loadPageAs,
-} from '../../../../../tasks/alert_assignments';
-
-// FLAKY: https://github.com/elastic/kibana/issues/176529
-describe.skip(
-  'Alert user assignment - Serverless Essentials',
-  {
-    tags: ['@serverless'],
-    env: {
-      ftrConfig: {
-        productTypes: [
-          { product_line: 'security', product_tier: 'essentials' },
-          { product_line: 'endpoint', product_tier: 'essentials' },
-        ],
-      },
-    },
-  },
-  () => {
-    before(() => {
-      cy.task('esArchiverLoad', { archiveName: 'auditbeat_multiple' });
-
-      // Login into accounts so that they got activated and visible in user profiles list
-      login(ROLES.t1_analyst);
-      login(ROLES.t2_analyst);
-      login(ROLES.t3_analyst);
-      login(ROLES.soc_manager);
-      login(ROLES.detections_admin);
-      login(ROLES.platform_engineer);
-    });
-
-    after(() => {
-      cy.task('esArchiverUnload', 'auditbeat_multiple');
-    });
-
-    beforeEach(() => {
-      loadPageAs(ALERTS_URL);
-      deleteAlertsAndRules();
-      createRule(getNewRule({ rule_id: 'new custom rule' }));
-      waitForAlertsToPopulate();
-    });
-
-    context('Authorization / RBAC', () => {
-      it('users with editing privileges should be able to update assignees', () => {
-        const editors = [
-          ROLES.t1_analyst,
-          ROLES.t2_analyst,
-          ROLES.t3_analyst,
-          ROLES.rule_author,
-          ROLES.soc_manager,
-          ROLES.detections_admin,
-          ROLES.platform_engineer,
-        ];
-        editors.forEach((role) => {
-          loadPageAs(ALERTS_URL, role);
-          waitForAlertsToPopulate();
-
-          // Unassign alert
-          selectFirstPageAlerts();
-          bulkRemoveAllAssignees();
-          refreshAlertPageFilter();
-
-          updateAssigneesForFirstAlert([role]);
-
-          // Assignees should appear in the alerts table
-          alertsTableShowsAssigneesForAlert([role]);
-        });
-      });
-    });
-  }
-);
diff --git a/x-pack/test/security_solution_cypress/cypress/tasks/alert_assignments.ts b/x-pack/test/security_solution_cypress/cypress/tasks/alert_assignments.ts
index ff2d2c8814869..460b9bf14ea33 100644
--- a/x-pack/test/security_solution_cypress/cypress/tasks/alert_assignments.ts
+++ b/x-pack/test/security_solution_cypress/cypress/tasks/alert_assignments.ts
@@ -111,7 +111,7 @@ export const cannotAddAssigneesViaDetailsFlyout = () => {
   cy.get(ALERT_DETAILS_ASSIGN_BUTTON).should('be.disabled');
 };
 
-export const alertsTableShowsAssigneesForAlert = (users: SecurityRoleName[], alertIndex = 0) => {
+export const alertsTableShowsAssigneesForAlert = (users: string[], alertIndex = 0) => {
   cy.get(ALERT_ASIGNEES_COLUMN)
     .eq(alertIndex)
     .within(() => {
@@ -119,7 +119,7 @@ export const alertsTableShowsAssigneesForAlert = (users: SecurityRoleName[], ale
     });
 };
 
-export const alertsTableShowsAssigneesForAllAlerts = (users: SecurityRoleName[]) => {
+export const alertsTableShowsAssigneesForAllAlerts = (users: string[]) => {
   cy.get(ALERT_ASIGNEES_COLUMN).each(($column) => {
     cy.wrap($column).within(() => {
       users.forEach((user) => cy.get(`.euiAvatar${ALERT_USER_AVATAR(user)}`).should('exist'));
@@ -127,7 +127,7 @@ export const alertsTableShowsAssigneesForAllAlerts = (users: SecurityRoleName[])
   });
 };
 
-export const alertsTableShowsAssigneesBadgeForFirstAlert = (users: SecurityRoleName[]) => {
+export const alertsTableShowsAssigneesBadgeForFirstAlert = (users: string[]) => {
   cy.get(ALERT_ASIGNEES_COLUMN)
     .first()
     .within(() => {
@@ -136,13 +136,13 @@ export const alertsTableShowsAssigneesBadgeForFirstAlert = (users: SecurityRoleN
     });
 };
 
-export const alertDetailsFlyoutShowsAssignees = (users: SecurityRoleName[]) => {
+export const alertDetailsFlyoutShowsAssignees = (users: string[]) => {
   cy.get(DOCUMENT_DETAILS_FLYOUT_HEADER_ASSIGNEES).within(() => {
     users.forEach((user) => cy.get(`.euiAvatar${ALERT_USER_AVATAR(user)}`).should('exist'));
   });
 };
 
-export const alertDetailsFlyoutShowsAssigneesBadge = (users: SecurityRoleName[]) => {
+export const alertDetailsFlyoutShowsAssigneesBadge = (users: string[]) => {
   cy.get(DOCUMENT_DETAILS_FLYOUT_HEADER_ASSIGNEES).within(() => {
     cy.get(ALERT_ASSIGNEES_COUNT_BADGE).contains(users.length);
     users.forEach((user) => cy.get(`.euiAvatar${ALERT_USER_AVATAR(user)}`).should('not.exist'));
@@ -165,7 +165,7 @@ export const selectAlertAssignee = (assignee: string) => {
  * This will update assignees for selected alert
  * @param users The list of assugnees to update. If assignee is not assigned yet it will be assigned, otherwise it will be unassigned
  */
-export const updateAssigneesForFirstAlert = (users: SecurityRoleName[]) => {
+export const updateAssigneesForFirstAlert = (users: string[]) => {
   openFirstAlertAssigningActionMenu();
   waitForAssigneesToPopulatePopover();
   users.forEach((user) => selectAlertAssignee(user));
@@ -173,7 +173,7 @@ export const updateAssigneesForFirstAlert = (users: SecurityRoleName[]) => {
   cy.get(ALERTS_TABLE_ROW_LOADER).should('not.exist');
 };
 
-export const updateAssigneesViaAddButtonInFlyout = (users: SecurityRoleName[]) => {
+export const updateAssigneesViaAddButtonInFlyout = (users: string[]) => {
   cy.get(ALERT_DETAILS_ASSIGN_BUTTON).click();
   waitForAssigneesToPopulatePopover();
   users.forEach((user) => selectAlertAssignee(user));
@@ -181,7 +181,7 @@ export const updateAssigneesViaAddButtonInFlyout = (users: SecurityRoleName[]) =
   cy.get(ALERTS_TABLE_ROW_LOADER).should('not.exist');
 };
 
-export const updateAssigneesViaTakeActionButtonInFlyout = (users: SecurityRoleName[]) => {
+export const updateAssigneesViaTakeActionButtonInFlyout = (users: string[]) => {
   cy.get(ALERT_DETAILS_TAKE_ACTION_BUTTON).click();
   cy.get(ALERT_ASSIGN_CONTEXT_MENU_ITEM).click();
   waitForAssigneesToPopulatePopover();
@@ -190,7 +190,7 @@ export const updateAssigneesViaTakeActionButtonInFlyout = (users: SecurityRoleNa
   cy.get(ALERTS_TABLE_ROW_LOADER).should('not.exist');
 };
 
-export const bulkUpdateAssignees = (users: SecurityRoleName[]) => {
+export const bulkUpdateAssignees = (users: string[]) => {
   openAlertAssigningBulkActionMenu();
   waitForAssigneesToPopulatePopover();
   users.forEach((user) => selectAlertAssignee(user));
@@ -216,9 +216,10 @@ export const bulkRemoveAllAssignees = () => {
   cy.get(ALERTS_TABLE_ROW_LOADER).should('not.exist');
 };
 
-export const filterByAssignees = (users: Array<SecurityRoleName | typeof NO_ASSIGNEES>) => {
+export const filterByAssignees = (users: Array<string | typeof NO_ASSIGNEES>) => {
   cy.get(FILTER_BY_ASSIGNEES_BUTTON).scrollIntoView();
   cy.get(FILTER_BY_ASSIGNEES_BUTTON).click();
+  cy.get(FILTER_BY_ASSIGNEES_BUTTON).trigger('mouseleave');
   users.forEach((user) => selectAlertAssignee(user));
   cy.get(FILTER_BY_ASSIGNEES_BUTTON).click();
 };
diff --git a/x-pack/test/security_solution_cypress/cypress/tasks/login.ts b/x-pack/test/security_solution_cypress/cypress/tasks/login.ts
index 90c9d245c3bba..036f9c56d6293 100644
--- a/x-pack/test/security_solution_cypress/cypress/tasks/login.ts
+++ b/x-pack/test/security_solution_cypress/cypress/tasks/login.ts
@@ -40,6 +40,13 @@ export const getEnvAuth = (role: SecurityRoleName): User => {
   return user;
 };
 
+export const getDefaultUserName = (): string => {
+  if (Cypress.env(IS_SERVERLESS)) {
+    return Cypress.env(CLOUD_SERVERLESS) ? 'admin' : 'system_indices_superuser';
+  }
+  return defaultUser.username;
+};
+
 export const login = (role?: SecurityRoleName): void => {
   let testRole = '';