Someone on my Apple ID
Someone on my Apple ID and downloading date sites. How can I find out who this is
iPhone 13 Pro Max, iOS 15
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If they are using your Apple ID, it will appear to be you -- I don't know of a way to further identify the person. But I would recommend that you change your password. See both of the following: Change your Apple ID password - Apple Support
and If you think your Apple ID has been compromised - Apple Support