Need to find other Apple ids
I want to see if other Apple ids are on my account
iPhone 6s, iOS 15
Other Apple IDs can't sign into your account. Do you want to see if other devices/computers are signed into your Apple ID?
Check your device list to see if there is a device signed in that you don't recognize. You can remove the device using the steps in the article below. As a precaution, change your password.
Apple ID device list -Check to see where you‘re signed in. *
See who has access to your device or accounts
ASC YouTube for How to reset your Apple ID password
What to do after you change your Apple ID or password - Apple Support - I suggest doing this before you change your Apple ID or password.