I encounter an issue with Android Firebase Auth using com.google.gms:google-services:3.0.0 and com.google.firebase:firebase-auth:9.0.1.
1
If we use default Auth providers like (Google, Facebook, Email..), updating "SHA-1 key" of your Application in firebase console would fix the token expiry issue.
In this discussion a Google developer shared a guide to solve this problem.
Guide: https://drive.google.com/file/d/0B94LePkXiqa6SXVFd3N1NzJHX1E/view