You are the sole owner of said accounts and nobody, not even Bungie has access to that information. Accounts cannot be removed for any reason. You must be able to do it.
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Can they just not unlink it for me without the authentication? Surely they can see all my other links are authenticated.
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Hi there! Bungie cannot unlink any accounts from any profiles for any reason. For more information, please review the Cross Save Guide, linked below. https://help.bungie.net/hc/en-us/articles/360049498031-Destiny-2-Cross-Save-Guide