I forgot the gamecenter account that my clash of clans is attached to

So I'm trying to link my CoC account to another device but when I do it, it just says that the Game Center account that I am using is different from the Game Center account that's attached to my Clash of Clans village.

I've tried every possible account and tried making a new one but the results are the same. I was wondering if there's a way to actually know what Game Center account is linked to my Clash of Clans account. Thank you.