What's the issue? Some players are reported Unable to Authenticate error messages when they try to load the game (see below).
unable-to-authenticate-error-message

Who is affected? At present, only a handful of Android players have reported the issue.

What should I do? If you encounter this error message, please contact our support team. Make sure to include your device specs (make, model, and OS) and the version of Google Play Games installed on your device. You can find your Google Play version on most Android devices by following these steps:
  1. Navigate to Settings on your device
  2. Tap on Apps
  3. Use the search function to find Google Play Games
  4. Select it, and scroll down to the bottom. It should include the full version number (screenshot below)
how-to-find-google-play-version