Hey MORGANION,
So, in order to unlink the PlayStation account, you have to authenticate it. You must be able to log into it. Bungie can't forcibly de-link your account. It would be beneficial for you to contact your platform about recovering your account and or whoever that account owner is. If you are unable to gain access to your account, then you will not be able to unlink it from your current Bungie.net profile.
Thanks,
Jaredd
English
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A lot of folks are having this issue and recovering accounts are not always possible. I would love to see Bungie fix this so accounts that can't be authenticated can be deleted from the user profile. Or, give us the ability to delete our own Bungie.net accounts.