Read this document if you think your Apple ID has been compromised. --> https://support.apple.com/HT204145
For iOS 16 or later see how Safety Check on iPhone works to keep you safe. https://support.apple.com/guide/personal-safety/how-safety-check-works-ips2aad835e1/1.0/web/1.0
Use the information in this document to check your Apple ID device list to find where you're signed in --> https://support.apple.com/HT205064
Related materials:
Personal Safety User Guide
https://support.apple.com/guide/personal-safety/welcome/web
> open the Table of Contents and review the articles
A document with general information about security and your Apple ID --> https://support.apple.com/HT201303
Contact Apple for help with Apple ID account security. This page provides country-specific Apple Support contact information ➞ https://support.apple.com/HT201232