So on the Halo Channel, I am unable to watch Halo Nightfall from my Xbox. I tried reinstalling the app multiple times, including redownloading Halo Nightfall itself. I only get prompted with the message: “The content you have selected can’t be played at this time.” Yet I am able to access Halo 4: Foward Unto Dawn, Red Vs Blue, and HUNT The TRUTH perfectly fine. Does anybody know how to fix this issue so I am able to watch Halo Nightfall? Thank you. 
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> So on the Halo Channel, I am unable to watch Halo Nightfall from my Xbox. I tried reinstalling the app multiple times, including redownloading Halo Nightfall itself. I only get prompted with the message: “The content you have selected can’t be played at this time.” Yet I am able to access Halo 4: Foward Unto Dawn, Red Vs Blue, and HUNT The TRUTH perfectly fine. Does anybody know how to fix this issue so I am able to watch Halo Nightfall? Thank you.
Checking the database, it appears that you should have full access, as Nightfall does show being registered to Luke Nukem 43.
Do you happen to have DVR hardware/Streaming hardware inline to your Xbox? Are you connected to a multiport HDMI splitter?