I do not remember my steam account login credentials and the steam website has no existence of the steam account that is "activated" with my Destiny account.
So to deactivate it, it states I have to "authenticate" it. Can you please just REMOVE the account from my destiny account, so I can cross save with an updated Steam account.
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Bungie cannot unlink accounts from users' profiles. You will need to work with Steam to get the login information for that account. If you're unable to proceed, you have another option, which is to create a new bungie.net profile, link the correct Steam to that one, and move your other account(s) there. Doing this will result in losing any redeemed emblems from this Bungie profile.