2 suggestions below (which different amount of what you have to do), to restore being able to login to game.
Logout (or disable) GameCenter. Then log back into GameCenter (or keep disabled if you don’t need it).
-or- if that doesn’t work, you may have to also do the following extra steps.. Logout (disable) GameCenter. Uninstall MCOC, reboot device, reinstall MCOC. Then log back into GameCenter.
Comments
2 suggestions below (which different amount of what you have to do), to restore being able to login to game.
Logout (or disable) GameCenter.
Then log back into GameCenter (or keep disabled if you don’t need it).
-or- if that doesn’t work, you may have to also do the following extra steps..
Logout (disable) GameCenter.
Uninstall MCOC, reboot device, reinstall MCOC.
Then log back into GameCenter.
Also from Apple community..