If I understand correctly, then no one can help me with unlinking someone else's Xbox account?
The account requires authentication before I can cancel Cross Save.
Can I delete my Bungie account? Maybe then it will turn out unlinking someone else's Xbox?
The owner of the Xbox account is not responding, I tried to contact him, but he is offline. And I'm worried that in one moment I can lose all the characters, because he can delete them.
Bungie should have a tool to help the players, this is their resource, and if there was an account hack or Bungie did not introduce additional authentication on the site in time, then they should help solve these problems.
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Exactly, you need to authenticate to unlink (also to link, so whoever did it, if it wasn't you, must have known your login details for the other accounts you have Cross-Saved), and no, you can't delete a Bungie account.