Hey there, no there is not, there is no way to forcibly unlink without authenticating, also, cross-save is all or nothing, if you want to set it up, it must be across all linked accounts. But there is a workaround. However this process will cause you to [u]lose any code-redeemed emblems and digital Bungie rewards from this current Bungie Account[/u], as you'll be losing this 2012 account and creating a new one instead. If that doesn't matter, you could do the following, 1 - Create a throwaway Epic Games account, 2 - Link it to your Bungie Account, 3 - Logout, then use the Epic account to log back into your Bungie Account, 4 - You can then unlink XBox and Steam by authenticating them. 5 - Your current Bungie Account will now contain just the Epic account and PSN. (You can't unlink the account you used to authenticate the current session, that's why you'll be using a throwaway account from a different platform, to let you separate the accounts you want to remove) 6 - Log back into Bungie.net using your XBox account. A new Bungie Account will be created for it. 7 - Link Steam to this new Bungie Account. 8 - You can now set up cross-save between XBox and Steam.