Hi there. To change an account linked to your profile, you must deactivate Cross Save first, which requires you to authenticate the login credentials of each account. Please be aware that deactivating Cross Save for any reason requires players to wait 90 days before it can be reactivated. You can switch Steam account links at any time during or after the 90 days. You should be able to authenticate the account by reentering the same email and password you used when setting up your Cross Save. If you are unable to authenticate the right credentials or you've deleted the Steam account, you'll need to contact Steam Support to see if they can help. For more info, see the [url=https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide]Cross Save Guide[/url]. For security and privacy reasons, Bungie will not forcibly remove the account from your profile nor can they swap it with a different Steam account of your choosing.