How do we prevent ?
Someone added their desktop to my account stole money for songs? How do we prevent ? Already removed their device
iPhone 8 Plus
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Best reply
Definitely change your password. Also consider doing a name change and adding 2 Factor Authentication to your account for more security.
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.
Apple ID -Two-factor authentication
Two Factor Authentification availability
Apple ID - Using app-specific passwords
Apple ID - Two Step Verification App Specific Passwords