i go to settings>icloud>my apple id>password&security
on the next page is
birthday
change password
change security questions
add rescue emaill
where is the 2 factor authentication?
thanks!!
iPhone 6s, iOS 9.3.2
I am a long-time Apple customer with many iOS and OS X devices. I also do not have two-factor authentication available to me.
I believe the reason in my case is that I have been using two-step verification, a slightly older security enhancement that provides even more safeguards than two-factor authentication.
Another possible reason for not seeing two-factor authentication would be not having a valid credit card on file for your Apple ID. Here is Apple's writeup on the subject:
Availability of two-factor authentication in iOS 9 and OS X El Capitan - Apple Support
Cant see 2 factor authentication option
