Google Play Services & Google Mobile Ads Together Issue

Hi friends, sorry for my bad english. In my mobile game, players are logged into Google Play Games and connected to the score table. Google play Services and Firebase Auth plugins are installed for t$$anonymous$$s. But I need to show an advertisement. That's why I use the Gogole Mobile Ads plugin, but the game gives a "stopped working" error after building it in the phone. I tried it in the Admob Unity plugin, I was getting a repackage resources error, but it took care of it. Now I can't log in from the google play games and google ads don't work. Does anyone know the solution?