This is because the facebook account has a diamond membership on it. If you message me privately the usernames on both accounts, i can remove the diamond so you can merge the accounts, then if you let me know once this has been done i can re-add the diamond membership for you.
Error 717 when trying to Merge
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I'm getting a 717 error when trying to merge this account with my chess.com account. The Chess.com account name is arehm, can someone assist?