Please try the following:
1. Update Google Play to the latest version
2. Update Google Play Games to the latest version https://play.google.com/store/apps/details?id=com.google.android.play.games
3. Update Google Play Services to the latest version https://play.google.com/store/apps/details?id=com.google.android.gms
4. Smartphone settings > Apps > Google Play Games (Enable) > Download Google Play Games if not available
5. Smartphone settings > Data > App usage > Google Play services > Restrict app background data (Disable)