A few years ago I linked my account to my friends PlayStation account, and now I have my own PlayStation. He doesn’t know his old email and password, how can I disconnect it if I don’t have the email or password?
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Your friend will need to use their platform's account recovery options in order to recover their login information, otherwise that Cross-Save will remain connected and your account linked. It's unfortunate that you chose to use Cross-Save in a manner that it wasn't intended for.
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in short, you can't. you need to be able to log into all attached accounts to disable CrossSave and remove accounts. he'll beed to work with platform support to regain access.
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[quote]how can I disconnect it if I don’t have the email or password?[/quote] You cant. Bungie wont forcibly unlink them nor will they disable cross-save to let you move the platform accounts to a different profile.