Hello there[url=https://cdn.discordapp.com/attachments/902560216871239752/978300950097842206/giphy.gif],[/url]
In order to unlink an account, you first have to disable cross save and/or unlink accounts, you must be able to authenticate the accounts. Bungie cannot forcibly de-link them.
[b]I would suggest contacting the platform concerning recovering the platform account.[/b]
If you are unable to gain access to your account, then you will not be able to deactivate cross save or unlink it from your current Bungie.net profile.
English
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I found the account which was a third one that had the online ID changed. Bungie doesn't reflect the updated User ID for PSN listed in the cross save page, and I only figured it out from pure luck as this name change happened all the way back in March. In addition, it also shows the old username in-game as an alias which I no longer wanted to be associated with, and was the reason I wanted to unlink/undo cross-save in the first place. There should be a better way to update linked account usernames without having to authenticate/disable cross-save as the process can be obscure as a result of said lack of updates.
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Just to add what the mentor said. Bungie doesn't store our login information. They use the systems authentication system for us to login.