Hello, I'll try to describe the problem.
1) Authorization CustomID + CreateAccountN1
... play game with CustomID + AccountN1
2) Facebook Authorization + CreateAccountN2 + LinkCustomID. After that, CustomID loses its AccountN1.
... play game with CustomID + AccountN2
3) Then I go out of Facebook and run UnlinkCustomID.
The question is how can the CustomID return to its AccountN1?
If you don't have an valid Session Ticket for the player account (N1), you can't make a Client API call for it. So the only way at that point to add the Custom ID to the account would be via the Game Manager. So, a member of your team could look up the player account and use the option to add an account link to it.
If you do still have an active Session Ticket, you could just use the LinkCustomID API call.
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