Redbox keeps asking me to sign in

I installed the Redbox app on my 4th gen Apple TV a few minutes ago. When I open the app, the sign in screen comes up. I enter my email address and the password, then click on the Sign In button. It takes me back to the screen with my apps on it. If I double click the tv icon and go to the, now opened Redbox app, the sign in screen is displayed. Seems like all I get it the sign in screen over and over again. I even tried entering the wrong password to see if something else would happen. In this case, I got an error telling me my login failed. So it appears to be taking my valid user id/password, but it doesn't actually sign me in.

Has anyone had success using the app?

Thanks