Unless you can log into the account, you will never be able to unlink it. You will need to contact PlayStation to try and recover it. For security and privacy reasons Bungie cannot help you with this. [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. https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide[/quote]