Hi there, Thank you for reaching out. If you are unable to access the linked Twitch account, then you will need assistance from Twitch support. You can contact them [url=https://help.twitch.tv/s/contactsupport?language=en_US]here[/url]. If you have access or regain access to the Twitch account, then you can unlink through Bungie account settings. To do this, go to Bungie.net Settings and then Accounts & Linking. Beneath your main platform accounts, you'll see your Twitch.tv link. You can unlink it there.