Those error messages are all erroneous, IMO.
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Is there any way to unlink(?) your locked-out accts from Game Center?
Can you contact GC?
(I'm not sure how GC works or what it's for. I just know to stay away thanks to forum warnings.
I don't dare link or associate any of my 11 GREE accts. CC, KA, & MW all have major problems with it.)