[quote]Already linked to other game platform accounts[/quote] Have you tried signing into Bungie.net as the Steam in case you have already linked it to a different Bungie profile? use incognito/safe browsing/inprivate etc whatever your browser calls it. If it puts you to the sign up form/account creation, just close the tab without continuing. If it signs you fully into an account that isn't the one you've posted from then you've already linked it to another Bungie profile.