Push Notification Not Working

Question

when i am uninstalling the appliction and installing again then it works fine(pushNotification Is working),But it is not proper way to uninstall every time. How solve this Error 

 

 

My Code

 

public class ZFFirebaseMessagingService : FirebaseMessagingService

{

const string TAG = "MyFirebaseMsgService";

public override void OnMessageReceived(RemoteMessage message)

{

Log.Debug(TAG, "From: " + message.From);

Log.Debug(TAG, "Notification Message Body: " + message.GetNotification().Body);

this.SendNotification(message.GetNotification().Body);

}

void SendNotification(string messageBody)

{

var intent = new Intent(this, typeof(MainActivity));

intent.AddFlags(ActivityFlags.ClearTop);

var pendingIntent = PendingIntent.GetActivity(this, 0, intent, PendingIntentFlags.OneShot);

var notificationBuilder = new Notification.Builder(this)

.SetSmallIcon(Resource.Drawable.logo)

.SetContentTitle("FCM Message")

.SetContentText(messageBody)

.SetAutoCancel(true)

.SetContentIntent(pendingIntent);

var notificationManager = NotificationManager.FromContext(this);

notificationManager.Notify(0, notificationBuilder.Build());

}

}