How to Remove a PSN Account from Another PS4
If you can't access the other PS4, sign in to your account on the PlayStation website and deactivate it from there: 'Account Settings' > 'Security' > 'Sign Out on All Devices'. This will sign you out everywhere, including the other PS4.
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Call up your buddy and have them remove it under 'Settings' > 'Login Settings' > 'User Management' > 'Delete User'. Easy peasy!
If you have no access to that PS4, simply change your PSN password. This will force a sign-out on all devices.
To remove your PSN account from another PS4, go to 'Settings' > 'Login Settings' > 'User Management' > 'Delete User' on that console. Make sure you select the right user profile!
Just signed out on all devices using the PlayStation website. Boom! Problem solved.
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