USTVNow Plus on Apple TV 4 won’t let me login

My issue with USTVNow Plus on Apple TV 4 is this:

When I configure USTVNow Plus from the Add-on Information, I put in my email and password, and I know the email and password are correct because it’s the same info I put on the desktop version.

When I open USTVNow Plus, it says I have to register for a free account, and it forces me to put in my email address again. However, once I successfully enter in my email address, I get to a blank screen and it doesn’t let me put in my password. And when I try to go back by hitting the Menu button on my Siri remote, it takes me back to the Apple TV main menu. In this case, in order to use Kodi, I am forced to restart my Apple TV.

Could this be an issue with Kodi? I’m asking because I’m using a 17.0 beta release downloaded from here. (I used kodi-20160824-fc0347d-yab-tvos.deb to build my Kodi IPA.)