In order to unlink an account, you must be able to authenticate it, which means you must be able to log into it. [b]I would suggest contacting Valve concerning recovering your Steam account.[/b] This will save you a lot of trouble and let you keep your current Bungie.net profile. If you are unable to gain access to your Steam account, then you will not be able to unlink it from your current Bungie.net profile. If you're trying to set up cross-save or the PC Migration, then your only option will be to create a new Bungie.net profile and then unlink/relink the accounts you actually want to that new Bungie.net profile. Just keep in mind that if you go with the new Bungie.net profile, you will lose access to the code-granted bonuses you've redeemed on Bungie.net because those are tied to your current Bungie.net profile. You can see what you'll lose here: https://www.bungie.net/en/Profile/Codes .