Can't watch Halo Nightfall

I purchased Halo TMCC on launch day, and I have never been able to watch Halo Nightfall. I’ve installed the game. I’ve entered the code. I’ve installed Halo Channel. I’ve actually uninstalled it and reinstalled it a few times now. I even contacted XBox One support for help, and they were unable to fix this. Does anybody know how to successfully watch these shows?