ios – Default FirebaseApp is just not initialized on this course of – Maui

I just lately applied firebase push notification into my maui app and going through an odd situation,

someday the applying works tremendous and someday it trows exception,saying:

Default FirebaseApp is just not initialized on this course of,Be sure to name FirebaseApp.initializeApp(Context) first

I suppose it’s one thing associated to firebase initialization,
beneath is my code:

public static class MauiProgram
  {
      public static MauiApp CreateMauiApp()
      {
          var builder = MauiApp.CreateBuilder();
          builder
              .UseMauiApp()
              .RegisterFirebaseServices()
              .UseMauiCommunityToolkit()

   personal static MauiAppBuilder RegisterFirebaseServices(this MauiAppBuilder builder)
        {
            builder.ConfigureLifecycleEvents(occasions => {
            #if IOS
                    occasions.AddiOS(iOS => iOS.WillFinishLaunching((_, __) => {
                        CrossFirebase.Initialize();
                        FirebaseCloudMessagingImplementation.Initialize();
                        return false;
                    }));
#if ANDROID
                        occasions.AddAndroid(android => android.OnCreate((exercise, _) =>
                        CrossFirebase.Initialize(exercise)));
#endif
                            });

            return builder;
        }

and on button handler, the place exception is being thrown whereas acquiring fcm token

if (CrossFirebaseCloudMessaging.Present != null)
  {
      await CrossFirebaseCloudMessaging.Present.CheckIfValidAsync();
      
          var token = await CrossFirebaseCloudMessaging.Present.GetTokenAsync();
          if (!string.IsNullOrEmpty(token))
          {
              Preferences.Set("deviceId", token);
          }
          else
          {
              return;
          }

I’ve adopted these tutorial:

https://maxmannstein.com/index.php/2025/01/19/implementing-firebase-cloud-messaging-in-net-maui-ios/

and

https://maxmannstein.com/index.php/2025/01/19/implementing-firebase-cloud-messaging-in-net-maui-android/