Is NBC.com doing copy protection or something with it? I tried Chrome, Firefox, and Safari web browsers. I even tried direct HDMI cable connection and through ATV 4K (2nd gen.). I don’t even get an AirPlay option to any ATV 4K with Safari web browser! I have no problems with YouTube.com, DailyMotion.com, etc. Everything is updated. :(
Thank you for reading and hopefully answering soon. :)
You might want to look into the Mac video download utility Downie and, possibly, the video encoding program Handbrake.
Downie makes downloading video from many websites easy. Handbrake, while not as easy to use as Downie, is a good way to change a video from one format (say, a YouTube stream) to another (for example, the format used by AppleTV’s).
I’ve been a highly satisfied, long time user of both programs. Downie’s developer is especially responsive and conscientious.