Apple ID verification code Disappears with Windows iCloud Verification
When verifying iCloud (for the iCloud passwords), the verification option disappears in nanoseconds. I have developed a solution to this problem, but it requires a couple of items. You need a Mac and an iPhone to solve this issue, until Apple recognizes this is a problem and fixes it.
Using a Mac, ensure that it is connected to your iCloud account.
Using any iPhone, preferably one with slow-motion video.
Set up the iPhone in video mode and begin recording your mac screen.
Authenticate iCloud on the Windows PC.
Immediately, hit the enter button on the Mac. Repeatedly hit the enter key, adding a half-second pause between each time you hit it.
Next, stop the video on the iPhone and replay the video until you see the verification code.
If all goes well, you should be able to enter the verification code from your phone and successfully log into iCloud on the Windows PC.