[No QA] Restore commented-out SAML redirect to signin code

src/libs/Reauthentication.ts

@@ -140,10 +140,9 @@ function reauthenticate(command = ''): Promise<boolean> {
         // Prevent reauthentication if credentials are missing (e.g. after sign out)
         if (!credentials?.autoGeneratedLogin || !credentials?.autoGeneratedPassword) {
             Log.info('[Reauthenticate] No credentials available, redirecting to sign in');
-            // The following lines are commented out to test if it's the cause of #fireroom-2026-01-28-user-signout
-            // setIsAuthenticating(false);
-            // redirectToSignIn('No credentials available');
-            // return false;
+            setIsAuthenticating(false);
+            redirectToSignIn('No credentials available');
+            return false;
         }
 
         Log.info(`[Reauthenticate] Re-authenticating with ${shouldUseNewPartnerName ? 'new' : 'old'} partner name`);

tests/actions/SessionTest.ts

@@ -16,6 +16,7 @@ import {setHasRadio} from '@libs/NetworkState';
 import PushNotification from '@libs/Notification/PushNotification';
 // This lib needs to be imported, but it has nothing to export since all it contains is an Onyx connection
 import '@libs/Notification/PushNotification/subscribeToPushNotifications';
+import reauthenticate from '@libs/Reauthentication';
 import CONFIG from '@src/CONFIG';
 import CONST from '@src/CONST';
 import * as SessionUtil from '@src/libs/actions/Session';
@@ -62,6 +63,22 @@ beforeEach(() => {
 });
 
 describe('Session', () => {
+    test('reauthenticate redirects to sign in with "No credentials available" when credentials are missing', async () => {
+        // Given no signed-in user — beforeEach calls Onyx.clear(), so NetworkStore's credentials are null
+
+        const redirectToSignInSpy = jest.spyOn(SignInRedirect, 'default').mockImplementation(() => Promise.resolve());
+
+        // When reauthenticate is called with no credentials stored
+        const result = await reauthenticate('TestCommand');
+        await waitForBatchedUpdates();
+
+        // Then it should redirect to sign in instead of attempting to call Authenticate with undefined credentials
+        expect(result).toBe(false);
+        expect(redirectToSignInSpy).toHaveBeenCalledWith('No credentials available');
+
+        redirectToSignInSpy.mockRestore();
+    });
+
     test('Authenticate is called with saved credentials when a session expires', async () => {
         // Given a test user and set of authToken with subscriptions to session and credentials
         const TEST_USER_LOGIN = 'test@testguy.com';