How to turn off two factor authentication
If I go to setting security no option to turn off also in edit
also not in Apple ID site
Also the email link to turn off is date no longer valid
iPad, iOS 12
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If the date is no longer valid, you can't turn it off.
From the article below updated on 8 Nov 2019. 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.