I’ve been trying to get ‘signinwithphonenumber’ working for DAYS now, but I just can’t seem to do it on iOS. It works fine on Android, but try as I might, I cannot get the iOS version to work.

This is how I sign-in to firebase:

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Initialize Firebase
  await Firebase.initializeApp(
    name: '<app name>',
    options: DefaultFirebaseOptions.currentPlatform,
  ).then((_) {
    print("Firebase initialized successfully.");
  }).catchError((error) {
    print("Error initializing Firebase: $error");
  });

// Clear Firestore persistence here
  try {
    await FirebaseFirestore.instance.clearPersistence();
    print('Firestore persistence cleared.');
  } catch (e) {
    print('Error clearing Firestore persistence: $e');
  }

  // Set Firestore settings
  try {
    FirebaseFirestore.instance.settings = const Settings(
      persistenceEnabled: false,
      sslEnabled: false,
      cacheSizeBytes: Settings.CACHE_SIZE_UNLIMITED,
    );
    print('Firestore settings updated.');
  } catch (e) {
    print('Error setting up Firestore: $e');
  }

  globals.fbdb = FirebaseFirestore.instance;
  globals.fbauth = FirebaseAuth.instance;
  globals.fbs = FirebaseStorage.instance;

  // Run the app
  runApp(const <appname>());
}

This is where I try to verify the phone number:

  static Future<void> verifyPhoneNumber(String phoneNumber) async {
    await FirebaseMessaging.instance.getToken();

    print("+++ phoneNumber = ${phoneNumber}");
    await globals.fbauth.verifyPhoneNumber(
      phoneNumber: phoneNumber,
      verificationCompleted: (PhoneAuthCredential credential) async {
        // Auto-retrieve verification code
        print("Verification Complete has been triggered for some reason!");
      },
      verificationFailed: (FirebaseAuthException e) {
        // Verification failed
        print('+++ Verification failed. Error = ${e}');
      },
      codeSent: (String verificationId, int? resendToken) async {
        // Save the verification ID for future use
        print('got through to codeSent section');
      },
      codeAutoRetrievalTimeout: (String verificationId) {},
      timeout: Duration(seconds: 60),
    );
  }
}

And this always triggers the ‘verificationFailed’ section, with the error ‘Token mismatch’.

This is the AppDelegate.swift:

import UIKit
import Firebase
import Flutter
import FirebaseMessaging
import FirebaseAuth

@main
@objc class AppDelegate: FlutterAppDelegate {
    override func application(
        _ application: UIApplication,
        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
    ) -> Bool {
        // Firebase initialization
        GeneratedPluginRegistrant.register(with: self)
        Messaging.messaging().delegate = self
        return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    }

    override func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        if Auth.auth().canHandleNotification(userInfo) {
            print(userInfo)
            return
        }
        completionHandler(.newData)
    }

    override func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        Auth.auth().setAPNSToken(deviceToken, type: AuthAPNSTokenType.unknown)
    }
}

extension AppDelegate: MessagingDelegate {
    func messaging(_ messaging: Messaging, didReceiveRegistrationToken fcmToken: String?) {
        print("Firebase registration token: (String(describing: fcmToken))")
    }
}

Flutter version = 3.24.3 <> Stable channel
Dart 3.5.3
Devtools 2.37.3

Xcode: Version 15.4 (15F31d)

Android Studio Koala Feature Drop | 2024.1.2

Mac mini M2 Pro – 32GB

Testing on an iPhone 13 (real device)

• There are no compile issues
• All the plugins are up to date (all the Firebase ones are the latest versions available)
• The ‘firebase-options.dart’ file is set up and correct (checked)
• The URL Type with the REVERSE_CLIENT_ID is correct
• I’ve checked and double checked all the certificates from Apple, and the .p8 key has been re-generated about 4 times now just to ensure I wasn’t having some kind of blackout (!) when I was generating it or something
• ‘Authentication’ on the Firebase console is set up with ‘Sign in with Google’, ‘Sign In with phone number’ and ‘sign in with email address and password’ – all of which are enabled.
• The bundle names are all correct, as is the name of the Firebase app everywhere it’s referenced
• I’ve switched the ‘Autogenerated Key for iOS’ in Google Cloud Platform to being locked to iOS applications
• I’m a paid Apple Developer
• The right provisioning profile is set up
• The GoogleService-Info.plist is in the right place and all the content is correct
• The Background modes in the ‘signing & capabilities’ section are set to ‘Background Fetch’ and ‘Remote Notifications’

This is from hours upon hours of scouring StackOverflow, reading and re-reading the documentation from Google, and doing everything I can think of to get this to work…

…but all the same code (exactly) works perfectly on Android.

HELP! I’m losing the will to live!