You are required to be able to authenticate all linked accounts to manage your Cross Save setup and to remove them from your profile. You'll need to contact Steam support to see if they can reinstate the account so you can log into it. If they can't, unfortunately there's nothing you or Bungie can do and your Cross Save setup will be stuck the way it is.
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Thanks for the help. I did email steam, waiting to hear back. Wasn’t sure if there was another way.