So I've been having an issue with authenticating my steam account and the error says "The account you attempted to verify is not linked to your currently logged in account. Please try again with your linked account for this platform." but im 1000% sure that there's no other steam account linked I tried to unlink it but it says the same thing.
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That error indicates you are entering credentials for a different Steam account. You can verify this by logging out of bungie.net and then logging back in, but picking Steam as the account to log in with. Then enter your log in credentials. If you get a completely different Bungie.net profile then that means you have more than one Steam account and the one linked to your current profile is not the same account. You can use Steam's forgot password recovery to see all the accounts you have under one or more email addresses.