Greetings! Unfortunately, there is no way to remove accounts from your Cross Save setup if you cannot authenticate them when doing the deactivating process. I would try to work with the platform support of the account you are trying to authenticate. They could assist you in retrieving your account. [url=https://help.steampowered.com/]Steam Support[/url] [url=https://support.xbox.com/]Xbox Support[/url] [quote]Destiny Player Support and Bungie cannot modify or remove accounts linked to Bungie.net profiles. To protect player privacy and data, you must be able to log in to any linked accounts to prove ownership prior to modifying your linked account. If you no longer have access to a linked account, you will need to reach out to the specific platform’s support for assistance with account recovery options.[/quote] via the [url=https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide#authentication-issues-0-5]Cross Save Guide[/url].