Authenticator app is not working
Have you tried the following (taken from Google Authenticator site:


  My Google Authenticator codes aren’t working (Android)
  
  This might be because the time on your Google Authenticator app is not
  synced correctly.
  
  To make sure that you have the correct time:
  
  
  Go to the main menu on the Google Authenticator app
  Click Settings
  Click Time correction for codes
  Click Sync now
  
  
  On the next screen, the app will confirm that the time has been synced, and you should now be able to use your verification codes to sign in. The sync will only affect the internal time of your Google Authenticator app, and will not change your device’s Date &amp; Time settings.