How can I know if another device is using my Apple Account?
Other device using my Apple account, iCloud
Question marked as
Use the information in this document to check your Apple ID device list to find where you're signed in --> Check your Apple Account device list to find where you’re signed in - Apple Support
- Learn which devices appear in your Apple ID device list, how to find your device's details (including if it's a trusted device), and how to remove a device.
- Special section at the end on how to "Permanently remove a device from your account page"