some reason years ago i made and add some xbox account and now cant remember the details. cant do cross save until i work out the details and cant remove it because again dont know the details.
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You'll need to contact Xbox support to recover your account. Bungie cannot manually unlink accounts from users' profiles. If you are unsuccessful in recovering the account, you'll need to create a new Bungie.net profile and link your current account(s) in there. Note that creating a new profile and abandoning the old will result in you losing any purchased/earned special emblems as they are tied to the Bungie profile.