how do you remove Two-Factor Authentication from I phone

If you enabled it more than two weeks ago,, or if you bought the phone with it already enabled, you cannot remove it. If it was not initially enabled, and you enabled it less thann two weeks ago, you can use the link in the confirmation email to turn it off.

https://support.apple.com/HT204915

Enter your password followed immediately by the code, e.g. 'password123456'.

You should get a pop-up on the Mac where you can enter the code. If you then trust the device you shouldn't havew to keep doing this, though occasionally both the request and the code will pop up together.

So if you sign into an Apple service on the Mac you should should get this. Do you have an up to date system? Older systems won't produce the pop-up, but you should be able to get in by entering the code immedately after the password, e.g. 'password1234546'.

Enter your password followed immediately by the code, e.g. 'password123456'.