Turn off two factor authentication
Why can't I turn off two factor authentication on my child's phone? I did not set this up.
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See Two-factor authentication for Apple ID https://support.apple.com/en-us/HT204915 and more specifically the section entitled Can I turn off two-factor authentication after I’ve turned it on? The answer is no, unless you recently updated your account. In this case, you can unenroll within two weeks of enrollment.