FCM 오류:

Xamarin Forms: Targeting S+ (version 31 and above) requires that one of FLAG_IMMUTABLE or FLAG_MUTABLE be specified when creating a PendingIntent

Nuget 설치:
Xamarin.AndroidX.Lifecycle.LiveData
Xamarin.AndroidX.Work.Runtime

변경전: var pendingIntent = PendingIntent.GetActivity(this, AdnroidNotification.NOTIFICATION_ID, intent, PendingIntentFlags.OneShot);

변경후:

var pendingIntent = PendingIntent.GetActivity(this, AdnroidNotification.NOTIFICATION_ID, intent, PendingIntentFlags.Immutable);