I can't deactivate Cross Save because my Steam account doesn't exist anymore...
Was trying to connect my old 2014 steam account to Bungie Cross Save, but stupidly deleted the other Steam Account that was currently linked to the Cross Save, and now can't authenticate, Therefore not being able to deactivate Cross Save...
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Steam allows you to undo an account deletion if the request was processed within the last 30 days. So if the deletion was within the last 30 days you should be able to recover the account. If it has been past the 30 days, it can't hurt to ask them, but if they are unable to un-delete the account then it will forever be stuck on this profile and cross save set up.