Didn't get token in Android

I did all the necessary steps from create a new project into Firebase to integrate into React and Android Studios. Everything is working fine at iOS side. But in android, I am not able to get token:

FCM.getFCMToken().then(token => {
alert("TOKEN (getFCMToken)", token);
//send to the server
});

I just regenerate the SHA fingerprints and check it again. But doesn't work for me?

Any solutions?