Flutter Firebase Messaging (Push Notifications) Not Working for iOS in an Already Existing Application


Firebase messaging works perfectly for Android, but the iOS build cannot receive notifications. I followed this tutorial to add push notifications to the application: https://www.youtube.com/watch?v=u-7ut-phOrA. The only difference is that I already had an App Identifier in the Apple Developer Portal. So instead of creating a new identifier, I enable push notification on the existing identifier.

The permissions are asked in the application as such:

void requestAndRegisterNotification() async {
  await Firebase.initializeApp(
    options: DefaultFirebaseOptions.currentPlatform,

  NotificationSettings settings =
      await FirebaseMessaging.instance.requestPermission(
    alert: true,
    badge: true,
    provisional: false,
    sound: true,

  if (settings.authorizationStatus == AuthorizationStatus.authorized) {
    print('User granted permission');

    FirebaseMessaging.onMessage.listen((RemoteMessage message) {
          'Message title: ${message.notification?.title}, body: ${message.notification?.body}, data: ${message.data}');
  } else {
    print('User declined or has not accepted permission');

The function was called in the InitState, and I can see the app is requesting permissions when testing.

The certificate in the Developer Portal looks like this: Certificate. The Indentifier looks like this: Identifier. The Key for the push notification looks like this: Key. The Firebase Cloud Messasing APNs looks like this: Firebase.

The AppDelegate file in the Runner has been modified to this:

import UIKit
import Flutter
import Firebase
import FirebaseMessaging

@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
    override func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        Messaging.messaging().apnsToken = deviceToken
        super.application(application, didRegisterForRemoteNotificationsWithDeviceToken: deviceToken)

I’m not able to understand where the error is coming from. The Android build works as expected, but iOS is not even recieving the push notification with a physical device. Even when I try to send the notification to a specific FCM token directly from Firebase.