title: Xamarin Android FCM Token invalid & not registered after some tries in Firebase Push Notification
body: <p>In Xamarin Android, while developing firebase push notification i followed all the methods and concepts as per the Firebase Documentation. Now, the token generated successfully, when i try to sent notification from the firebase console, it shows completed and i tried postman also it give success status:1 but after sometimes i tried to send notification, it gave the result like token id was invalid and not registered. Another important thing is at any situation, notification is not received in My device. How can i solve this?</p>