Facebook logging into wrong app on iOS

Question

My iOS app uses Facebook for logging in, however my dev team recently decided to consolidate all our apps into one universal Facebook app with a common APP ID. So I went into my project and tried to change my FacebookAppID and URL Types to the right APP ID, but when I run the app and click on the login button, it redirects me to log into my old app on Facebook. I have absolutely no idea why this is happening, but here is what I have in my AppDelegate file:

/*
 Callback for session changes
*/
- (void)sessionStateChanged:(FBSession *)session
                  state:(FBSessionState) state
                  error:(NSError *)error
{
switch (state) {
    case FBSessionStateOpen:
        if (!error) {
            // We have a valid session
            NSLog(@"User session found");
        }
        break;
    case FBSessionStateClosed:
    case FBSessionStateClosedLoginFailed:
        [FBSession.activeSession closeAndClearTokenInformation];
        break;
    default:
        break;
}

[[NSNotificationCenter defaultCenter]
 postNotificationName:FBSessionStateChangedNotification
 object:session];

if (error) {
    UIAlertView *alertView = [[UIAlertView alloc]
                              initWithTitle:@"Error"
                              message:error.localizedDescription
                              delegate:nil
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
    [alertView show];
    }
}

/*
 * Opens a Facebook session and optionally shows the login UX.
 */
- (BOOL)openSessionWithAllowLoginUI:(BOOL)allowLoginUI {
    NSArray *permissions = [[NSArray alloc] initWithObjects:
                        @"email",
                        @"user_games_activity",
                        @"user_location",
                        @"user_likes",
                        @"user_birthday",
                        nil];
return [FBSession openActiveSessionWithReadPermissions:permissions
                                          allowLoginUI:allowLoginUI
                                     completionHandler:^(FBSession *session,
                                                         FBSessionState state,
                                                         NSError *error) {
                                         [self sessionStateChanged:session
                                                             state:state
                                                             error:error];
                                     }];
}

/*
 * If we have a valid session at the time of openURL call, we handle
 * Facebook transitions by passing the url argument to handleOpenURL
 */
- (BOOL)application:(UIApplication *)application
        openURL:(NSURL *)url
  sourceApplication:(NSString *)sourceApplication
     annotation:(id)annotation {
    // attempt to extract a token from the url
    return [FBSession.activeSession handleOpenURL:url];
}
/*
 *Logout
 *
 */
- (void) closeSession {
    [FBSession.activeSession closeAndClearTokenInformation];
}

gaurav · Answer 1 · Dec 15, 2022

The issue may be caused by various reasons, e.g. improper cookie settings, another person may be trying to log into your Facebook account, Facebook session expired, corrupt or wrong browser caches, malware or virus infection, etc.