Check your MyFirebaseInstanceIDService class there will be a method onTokenRefresh(). You will get refreshedToken in this method like below:
public void onTokenRefresh() {
// Get updated InstanceID token.
String refreshedToken = FirebaseInstanceId.getInstance().getToken();
// TODO: Implement this method to send any registration to your app's servers.
sendRegistrationToServer(refreshedToken);
}
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solved How to get firebase generated unique id [closed]