I received notification that an unknown device used my Apple ID
The email has the machine name, how do I find out who that is? Or who do I report it to?
Question marked as
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.
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.
There isn't a way to know who it is or anyone you can report it to.