i login into bungie account to unlink my steam account but the button for unlink is not full red
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You cannot unlink the account you log into Bungie.net with during that login. If you logged in using your Steam ID, you cannot unlink it. If you wish to unlink your Steam ID, you'll have to have another platform account linked and then log into Bungie.net with that one, then you can unlink the Steam ID.