Apply suggestions from code review

Co-authored-by: Peter Wilson <[email protected]>

assets/js/admin-external-connection.js

@@ -317,7 +317,8 @@ function checkConnections() {
 			} else if (
 				response.data.errors.no_external_connection ||
 				'no' === response.data.is_authenticated ||
-				response.data.errors.no_distributor
+				response.data.errors.no_distributor ||
+				! response.data.can_post.length
 			) {
 				endpointResult.setAttribute( 'data-endpoint-state', 'error' );
 
@@ -353,6 +354,21 @@ function checkConnections() {
 						),
 						'polite'
 					);
+				} else if (
+					'no' === response.data.is_authenticated ||
+					response.data.errors.no_types
+				) {
+					endpointResult.innerText = __(
+						'Authentication failed due to insufficient or invalid credentials.',
+						'distributor'
+					);
+					speak(
+						__(
+							'Authentication failed due to insufficient or invalid credentials.',
+							'distributor'
+						),
+						'polite'
+					);
 				} else {
 					endpointResult.innerText = __(
 						'No connection found.',

tests/cypress/e2e/external-connection.test.js

@@ -111,7 +111,7 @@ describe( 'Admin can add a new external connection', () => {
 		);
 		cy.get( '.endpoint-result' ).should(
 			'contain.text',
-			'No connection found'
+			'Authentication failed due to insufficient or invalid credentials.'
 		);
 	} );
 } );