Turn OFF Two-factor authentication on iphone 11.
I can't be able to turn off the Two-factor authentication on my iphone 11.
iPhone 11, iOS 14
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2 Factor Authentication
Two-factor authentication for Apple ID
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, you can unenroll for 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 higher security.
https://support.apple.com/en-in/HT204915