same issue i got. just sorted now. I’m using the game clash of clans. I open the game and it asked for my appleid(since i’m not log in on the game center). input my game center id and pw. now go to settings-game center it automatically logs in the appleid and pw the one you used on the clash of clan games. now log in log out and it works..hope it will solve your issue as well..
harryporter
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