First, make sure you have updated the game to version 2.105.0 or later. Check your internet connection and make sure that you have the latest version of the Google Play Games app and that you are signed into it. Try tapping on the "not signed in" message in-game to attempt to sign in again. If that doesn't work then try rebooting your device.
Also note that if you're using Family Link then signing in with Google Play Games is not currently supported. Unfortunately, we can't fix this as it's controlled by Google.
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