No input fields for the Apple ID Verification for the iMac 10.10.5

Solution 1:

Got exactly the same problem today, e.g:

• have two-factor auth.
• tried login to icloud on some old macbook (OSX Lion - 10.7)
• on my iphone i got the code
• but on the macbook there are no input fields - e.g. impossible to enter the code - there is no place where.

More googling and I found this page: https://support.apple.com/en-us/HT204915 where says:

What if I use two-factor authentication on a device running older software?

If you use two-factor authentication with devices running older OS versions—like an Apple TV (2nd or 3rd generation)—you might be asked to add your six-digit verification code to the end of your password when signing in. Get your verification code from a trusted device running iOS 9 and later or OS X El Capitan and later, or have it sent to your trusted phone number. Then type your password followed by the six-digit verification code directly into the password field.

So, in short: if you didn't get the input fields, do the following:

• on the trusted device "Get the verification code" how - see this
• and on the device without input fields enter your password, immediatelly followed by the 6 digit code - e.g. "MyPassord123456"

That's all - it works. :)