How do I sign out of iCloud or Apple ID without a password
How do I sign out of Apple ID or iCloud without a password
iPhone 11
Question marked as
You cannot, you first need to recover your password
If you have forgotten your Apple ID password – Apple Support (UK)
If you cannot change your password this way you can enroll in account recovery
How to use account recovery when you can’t reset your Apple ID password - Apple Support
If it isn't your Apple ID there is nothing you can do, only to ask the original owner to remove it