In order to unlink an account, you must be able to authenticate it, which means you must be able to log into it. [b]I would suggest contacting Microsoft concerning recovering your XBL account.[/b] This will save you a lot of trouble and let you keep your current Bungie.net profile. If you are unable to gain access to your XBL account, then you will not be able to unlink it from your current Bungie.net profile. If you're trying to set up cross-save, then your only option will be to create a new Bungie.net profile and then unlink/relink the accounts you actually want to that new Bungie.net profile.