I was getting an error when I tried to play the video as well but there is a small ellipses button in the bottom center when clicked it shows an option that says something like "Go Back to GB Video Player". Selecting that resolved the issue for me.
It looks like it might be an issue where it tries to play via YouTube but since this is a premium video there's probably something funky going on with access control. Anyways, hope my comment helps someone out.
Ducksworth's comments