I signed out of my iCloud account on my MacBook several days ago. After starting it up recently, I got a notification telling me a new device was using iMessage for my Apple ID. This really concerns me and how is it even possible?
Greetings Mufn8r,
Thanks for visiting the Apple Support Communities!
The following article shows helpful steps to view a list of devices where you're signed in with your Apple ID:
Check your Apple ID device list to see where you're signed in - Apple Support
You can see further information on steps to take if you believe your Apple ID may be compromised below:
If you think your Apple ID has been compromised - Apple Support
Kind regards.
iCloud Notification While Signed Out
