[quote]Is there anything I can do to fix this ?[/quote] No, the account is now permanently linked and Bungie will not step in/grant an exception. Even prior to the change they didn't step in and forcibly unlink accounts for people. In your specific case, you have your brothers account as your active profile for cross-save - all of your progression is permanently bound to that account so if you were able to unlink it you wouldn't be able to access it on PS or your own Steam account.