azurerm_maintenance_assignment_virtual_machine - maintenance configuration is now obtained by name rather than using the first in the list

internal/services/maintenance/maintenance_assignment_virtual_machine_resource.go

@@ -81,8 +81,16 @@ func resourceArmMaintenanceAssignmentVirtualMachineCreate(d *pluginsdk.ResourceD
 		return err
 	}
 	if existingList != nil && len(*existingList) > 0 {
-		existing := (*existingList)[0]
-		if existing.Id != nil && *existing.Id != "" {
+		isExist := false
+		for _, existing := range *existingList {
+			// Due to https://github.com/Azure/azure-rest-api-specs/issues/22894, API always returns the lowercase for Maintenance Assignment. So here it has to ignore case sensitivity. Once this issue is fixed, here will be updated to respect case sensitivity
+			if existing.Name != nil && strings.EqualFold(*existing.Name, configurationId.MaintenanceConfigurationName) {
+				isExist = true
+				break
+			}
+		}
+
+		if isExist {
 			return tf.ImportAsExistsError("azurerm_maintenance_assignment_virtual_machine", configurationId.ID())
 		}
 	}
@@ -137,7 +145,16 @@ func resourceArmMaintenanceAssignmentVirtualMachineRead(d *pluginsdk.ResourceDat
 		d.SetId("")
 		return nil
 	}
-	assignment := (*resp)[0]
+
+	var assignment configurationassignments.ConfigurationAssignment
+	for _, v := range *resp {
+		// Due to https://github.com/Azure/azure-rest-api-specs/issues/22894, API always returns the lowercase for Maintenance Assignment. So here it has to ignore case sensitivity. Once this issue is fixed, here will be updated to respect case sensitivity
+		if v.Name != nil && strings.EqualFold(*v.Name, id.Name) {
+			assignment = v
+			break
+		}
+	}
+
 	if assignment.Id == nil || *assignment.Id == "" {
 		return fmt.Errorf("empty or nil ID of Maintenance Assignment (virtual machine ID id: %q", id.VirtualMachineIdRaw)
 	}

internal/services/maintenance/maintenance_assignment_virtual_machine_resource_test.go

@@ -47,6 +47,22 @@ func TestAccMaintenanceAssignmentVirtualMachine_requiresImport(t *testing.T) {
 	})
 }
 
+func TestAccMaintenanceAssignmentVirtualMachine_linkMultipleMaintenanceAssignmentsToOneVM(t *testing.T) {
+	data := acceptance.BuildTestData(t, "azurerm_maintenance_assignment_virtual_machine", "test")
+	r := MaintenanceAssignmentVirtualMachineResource{}
+
+	data.ResourceTest(t, r, []acceptance.TestStep{
+		{
+			Config: r.linkMultipleMaintenanceAssignmentsToOneVM(data),
+			Check: acceptance.ComposeTestCheckFunc(
+				check.That(data.ResourceName).ExistsInAzure(r),
+			),
+		},
+		// location not returned by list rest api
+		data.ImportStep("location"),
+	})
+}
+
 func (MaintenanceAssignmentVirtualMachineResource) Exists(ctx context.Context, clients *clients.Client, state *pluginsdk.InstanceState) (*bool, error) {
 	maintenanceAssignmentVirtualMachineId, err := parse.MaintenanceAssignmentVirtualMachineID(state.ID)
 	if err != nil {
@@ -159,3 +175,28 @@ resource "azurerm_linux_virtual_machine" "test" {
 }
 `, data.RandomInteger, data.Locations.Primary)
 }
+
+func (r MaintenanceAssignmentVirtualMachineResource) linkMultipleMaintenanceAssignmentsToOneVM(data acceptance.TestData) string {
+	return fmt.Sprintf(`
+%s
+
+resource "azurerm_maintenance_configuration" "test2" {
+  name                = "acctest-MC2%[2]d"
+  resource_group_name = azurerm_resource_group.test.name
+  location            = azurerm_resource_group.test.location
+  scope               = "SQLDB"
+}
+
+resource "azurerm_maintenance_assignment_virtual_machine" "test" {
+  location                     = azurerm_resource_group.test.location
+  maintenance_configuration_id = azurerm_maintenance_configuration.test.id
+  virtual_machine_id           = azurerm_linux_virtual_machine.test.id
+}
+
+resource "azurerm_maintenance_assignment_virtual_machine" "test2" {
+  location                     = azurerm_resource_group.test.location
+  maintenance_configuration_id = azurerm_maintenance_configuration.test2.id
+  virtual_machine_id           = azurerm_linux_virtual_machine.test.id
+}
+`, r.template(data), data.RandomInteger)
+}