Hey there. Please refer to this information from the Cross Save guide: [quote]Players who can't authenticate connected platform accounts will have to contact their platform's support to try and gain access to the account. If that isn't successful, players may want to unlink their connected accounts they have access to and link them to another Bungie profile. [b][u]Bungie is not able to remove connected platform accounts from profiles under any circumstances.[/u][/b][/quote] [url]https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide[/url] You will need to try and work with Microsoft support to see if you can regain access to that account. If they aren't able to reinstate it so you can authenticate it here, unfortunately there's nothing that can be done. Your Cross Save setup will be stuck in its current configuration and you'll be unable to remove that account to link another one.