Why did I receive an Apple ID verification code when I didn't request it?
Why do I keep receiving text from 50472 and 81961 providing me an Apple ID code?
[Re-titled by Moderator]
iPhone 13 Pro, iOS 15
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Someone may be trying to sign your Apple ID, which would generate the request for a verification code. Since you have 2 Factor Authentication enabled, as long as they can't access one of your trusted devices, they can't get a code, and sign in. You should be okay.