WebSep 30, 2016 · 1. The code you posted is not the code throwing the exception. The exception occurs when you call mAuth.addAuthStateListener (mAuthListener) and mAuth is null. Confirm that you have executed mAuth = FirebaseAuth.getInstance (), before trying to add the listener. – Bob Snyder. WebLog into Facebook to start sharing and connecting with your friends, family, and people you know.

How to Enable (or Disable) Two-factor Authentication on Facebook …

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