Azure Test Send Not Working

I have an android application in which I am trying to implement Azure Push Notification.I am doing the following steps :-

1)Create an android application. 2)Register the android application developed in step one to get the token id. 3)Create a project in the Firebase Console and copy the legal server key. 4)Create a notification hub.In the notification hub under gcm register the legal server key generated in step 3. 5)Send a notification through test send feature of the azure portal.

I am getting success message but nothing is delivered to the device.Am I missing any step.Please suggest my work is stuck because of this.

Thanks in advance!