Apple ID authentication off
Not finding edit option in Apple ID two factor authentication (security)
iPhone 11 Pro Max, iOS 14
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Two factor authentication is not only a requirement for most Apple Account functions, it cannot be turned off.
Once set up you should rarely need to obtain verification codes, but make sure you add alternative trusted numbers in
Appleid.apple.com in the Security section to take care of problem where you only have one device and it is not available