As of recently I've been attempting to get back into D2 after Lightfall. Before Lightfall ended I got a computer after selling my other one 2 years prior. During this time I lost access to my steam account affiliated with the one currently on my account. It had no progression, barely any play time at all. And I simply can't authenticate the account to remove it and link it to my new steam account and get all my stuff from my Xbox account. Someone please help.
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Only Steam support can help you recover access to the account.