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Guys...

1. First of all Ensure you have completed your e-mail verification for apple ID,other wise your 2 way authentication option would be in "disabled" state .

then change/ turn it off with following steps:

1. Create new security questions to assign to the Apple ID, these are used in place of two-factor auth codes
2. When finished disabling two-factor auth you can log out of the Apple ID management website

Once two-factor authentication is disabled, you can log in to Apple ID from anywhere, whether on the web, iOS, iPhone, iPad, Mac, anywhere, with only a password again, you won’t need to double authenticate with a trusted device code.

Whether or not to use two-factor authentication is largely a matter of personal preference, there is no right or wrong answer here. Remember, you can always turn on two-factor auth for Apple ID again if you decide to use the service again at a later date. Either way, be sure to use a strong password.

I have a feeling that the problem lies with two-factor verification, which was introduced after Yosemite. If haven't gone through the trouble yet, but try to turn off 2-factor verification on your iPhone/iPad, or other computer, and try to update to Sierra then. Turn 2-factor back on when done ...

i had this issue, then realized that i had 2 factor authentication turned on. put in your password followed by the 6 digits that appear on another device in the same field. don't hit enter, just put the number in right after the password.

Apple doesn’t routinely monitor the discussions. These are mostly user to user discussions.

Send Apple feedback. They won't answer, but at least will know there is a problem or a suggestion for change. If enough people send feedback, it may get the problem/suggested change solved sooner.

Feedback

>put in your password followed by the 6 digits that appear on another device in the same field. don't hit enter, just put the number in right after the password.<

This works. I must say however that suggestions to disable two-factor authentication, however functional, are frustrating. Rather than 'work around' this brutal flaw, I'd like to see it fixed. Buying software is certainly the most critical reason to use 2-FA, for both my security and Apple's bottom line, so the fact that this doesn't work at Apple's primary point of sale online is completely absurd.

thanks a million. your post led me to someone else's who said to punch in the numbers after the password, which I was very far away from ever coming to on my own! I thought the passcode went in after the password, in a new field of entry, not in succession. yay, fixed!

When the error message comes on you should be getting a notification on another device prompting you a code.

Enter that code on you iMac right after your login password without any space. That will log you in.

Hope this helps

Thanks Buddy, in my dreams also I could not have thought of these options casing an issue I end changing password three times and wasted 2 hours and found your answer worked in5 minutes. Thank you mate. you are super star..

2FA came along after Yosemite, so any OS Yosemite or earlier, you have to generate a code from another device and enter the 6 digit code directly after the password before submitting. This isn't a glitch, the older OSs just don't have the facility to ask for the 2FA digits, so the engineers designed it so that it's submitted along with the password. That way 2FA codes can be entered on older OSs.

For starters, it's not necessary to disable two factor to get by this, simply use the trusted device you enabled two factor to generate a code, and tack it on to the end of the password. This is not a hack or workaround, two factor was designed so the code can be tacked onto the end of a password so two factor codes could be entered on software that doesn't support two factor authentication.

Secondly, all Apple IDs created moving forward are going to be two factor authentication, you will not have the option to disable two factor authentication. So turning it off isn't going to be an option for new apple ids moving forward.

To generate a code from an iOS device Go to settings>tap on your name>password and security (iOS 10.3.1), or Settings>iCloud>tap on your name>password and security for iOS older than 10.3.1.

I just verified this and the computer is downloading Sierra as I speak.

Solution: Turn off two-factor (not 2-step) verification in your iCloud account settings (website).

Hey,

I just followed this article and solve the issue

https://support.apple.com/en-us/HT204063

App Store support. There is troubleshooting and a contact link.

Support

This also works too:

If you see a -45054 error in the iTunes Store - Apple Support