STOLEN APPLEID?

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.   * 

 Apple ID Password Change.   -  

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.

Did you recently log in on an old phone? did you get a notification to enter your password on your current iPhone? If so, that log in, was you.

If not, change your Apple ID password: link-> Change your Apple ID password - Apple Support

and see here: link-> If you think your Apple ID has been compromised - Apple Support