I’ve recently bought a physical copy of the MCC and have had the very same issue as so many others are having with watching Halo Nightfall. I’ve researched endlessly looking for a fix, but nothing seems to work. I’ve followed the steps published by the support team but yet I’m still prompted to “Buy Nightfall” even though I have it installed. This is ridiculous, the MCC has been out since November of 2014 and there are still issues with it’s contents. I’d appreciate some help, thanks.
Thank you for your report. We’re currently tracking this issue in another thread: https://www.halowaypoint.com/en-us/forums/4b66b79375424f41add6422ddef89ffb/topics/halo-nightfall-support-thread/a38513c3-f539-4f36-9209-db935da22147/posts