no place to enter 2 step verification code after changing password

Try typing the password and the passcode in the same box. For example, password5678

OK, here's how I fixed it, and I can't believe I didn't think of this sooner!

1. Go to appleid.apple.com, sign in using password and supplied authentication code
2. Click the Edit button next to your account details and turn 2-factor authentication off. You'll have to supply new security questions and a rescue e-mail.
3. Click the blue Done button to save changes. You'll get notification(s) that 2-factor authentication has been turned off. Wait a couple of minutes for the change to propagate to various servers.
4. Apple menu -> System Preferences -> iCloud and put in the AppleID password.

This worked for me. After over a week of being locked out of iCloud, App Store, and iTunes, I'm back in business! Now that I'm back in iCloud, I may try to re-enable 2-factor authentication. Or not.

And I won't even get into how ridiculous it is that there is no instructions on where/when to type the code, since others on this thread have covered that so well.

see >>> Two-factor authentication for Apple ID - Apple Support

You might want to consider starting a new discussion. Since this one is marked solved, less people are likely to look at it. A new post would be much more visible. You can link to this one.

What happened? Error message?

such a useful thread. It is a nightmare using old Apple products in the modern age. I have various devices from 2008 to 2016. My Macbook from 2008 is practically unusable now that one cannot upgrade Browsers etc etc. logging into App Store as described here was a real nightmare because it leads you re setting your AppleID unnecessarily. Thanks a million!!

This worked for me too. I am disappointed with Apple's ham-fisted, anti-intuitive, and cryptic process to verify an Apple product with my Apple's iTunes' account. I am even more frustrated that there is an insane person out there who actually tried this illogical solution on their own for the first time. However, thank you for the solution. I guess now I know.

Thanks so much! This really helped! Also what's so baffling is that I have to enter my password FIRST, before the code is sent to my phone, which is a real catch 22 because I need the code to properly enter with my password, but I have to enter my password in order to get the code.

Beyond silly.

And I won't even get into how ridiculous it is that there is no instructions on where/when to type the code, since others on this thread have covered that so well.

Anyway, thank you for being a light in the darkness of this Kafka-esque MAC OS. 🙂

Hey, thanks so much for this! The same problem was plaguing me every time I used my mac. You are very smart to come up with this. Why does Apple use 2-factor authentication if it doesn't effing work??

There is no box to enter it in.

See this -- What to do after you change your Apple ID email address or password - Apple Support

Use this guide to verify your trusted devices by first going to https://appleid.apple.com

You are welcome. It is different. I'm not sure why it is so different.