Getting prompted for verification code but where do I put it in? I am using an old iPad -- it's an iPad 2 model MC990LL/A
-- running iOS 9.3.5
I noticed when I go to settings --&gt; iCloud and tap the top part where my name and ID is, I get this:

Account Details Unavailable
If you are signing in to iCloud on another device or at iCloud.com, you can get a verification code while offline.

I tap &quot;Get verification code&quot; and it sends one -- but where do I put it in? I saw the answers that said to tack it onto the end of your password but there's no password prompt!
I wanted to add my iPad to my list of trusted devices (my phone and computer are there) but there does not seem to be a way to do it.
Any help appreciated.
ETA: The help offere by bmike was great; as it happened turning it off and on again a couple of times did the trick after I reset the settings. (Not a full restore). But dang, the back compatibility is starting to go...
Tack the numbers on the end of the password if you don’t get a pop up to enter the code. 

That’s what happens on older os in general. 


Changing the Apple ID on a 1st generation iPad
No input field for Apple ID Verification Code


To be clear, if your password were thirteen-odd-variations and your second factor (iMessage) were 330000, then enter thirteen-odd-variations330000 as your password instead of what you usually enter.

If you don’t see a password prompt at all, you’ll want to make sure you have a backup of your device and then sign out of iCloud / App Store / wherever you wish to sign in so that you get the account / password dialog.


I’ve seen this happen when the certificate has expired and you need to sign out to release the old pairing from the keychain and then request a new session from iCloud


If you can’t ever get that dialog, you will want to restore the device from a computer or reset all content and settings - this erases everything, so be sure you have a backup or can afford to learn that the device has failed before doing the erase.