How to Turn OFF two-factor authentication
I have a lot of changes to make to our family accounts as a result of iOS12... how do I turn two-factor authentication off?
This update has been nothing but one big headache!
iPhone X, iOS 12
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From the article you linked from. If it has been on longer than 2 weeks, you can't turn it off.
Can I turn off two-factor authentication after I’ve turned it on?
If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, however, you can unenroll for a period of two weeks. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require a higher level of security.