I have my bungie account linked to my steam and my old PlayStation account. I want to unlink my PlayStation account because it was hacked and I no longer have access to it, but I cannot unlink it without signing in. Which I cannot do as I don't have access to the account anymore.
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You need to work with PlayStation support to recover access to the account. Bungie won't forcibly deactivate Cross Save or unlink any accounts for security reasons.