https://www.nfl.com/network/watch/nfl-redzone-live
Since the 2021 season starts this Thursday, that would be the first Sunday of the season.
That's the time to rescan the channel in Channels DVR if you haven't authorized it yet.
UPDATE: Appears it won't stream, please don't create new topics, use this one 
for discussion
Once authorized, do you need to rescan every week due to the stream going down during the rest of the week?
Right now when I scan it, it says no stream found - as expected.
Excuse the noobie question, this is my 1st year with channels dvr for fall football season.
I don’t believe so. Once it scans successfully it should work going forward (assuming you tune it when it’s live, of course).
Thanks!