Can you sign into Bungie.net as the Xbox account and do the deactivation that way since your Steam/PSN are authenticating fine
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when I sign in through xbox I get this error message instead. [url]https://imgur.com/a/Da04ECx[/url]
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If thats for Steam, are you manually typing in the info or using auto-fill? Steam allows you to have multiple accounts per email so make sure you're using the correct one.