Allo there, Unfortunately in order to unlink an account you must be able to authenticate it. Bungie can't do that for you as they don't have the account details of any of our accounts so they can't authenticate it for you. You'll need to work with Epic to gain control of the account in question. https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide [quote]Unknown Linked Accounts Bungie will not remove unauthorized Cross Save links from Bungie.net profiles. Players are recommended to not share their account details with anyone and to set up 2-step authentication on their platform accounts to prevent unauthorized access.[/quote]