FYI I lost the connection last night
Looks like this might have been fixed in 2021.09.16.1925
Yep. Workin here.
Don’t forget to rescan the channel
Not working for me even after prerelease update (2021.09.16.1925) on latest AppleTV beta. 
EDIT: In the NFL app I had to sign out and sign in. Maybe it's on their end.
Works now. Thanks for the heads up. Was hoping for a possible upgrade to 60fps like all of the NBC affiliates a few weeks ago but no such luck.
Sling TVE shows “no login form found” for NFL Network with the latest pre-release.
Please submit diagnostics
Same for me. “Invalid response”. Submitted diagnostics. aabb09a8-b94b-407e-a520-82aa7150ef9a
Those diagnostics are from v2021.09.10.2301
Fix uploading in v2021.09.17.0006
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Does not work for me. Just spins and spins like before. v2021.09.17.0006
Something weird is going on with your DVR. Its trying to load the nfl site and getting a weird error message:
I have a PR2100 and the last few beta updates freeze my Channels DVR and the webpage won't reload and I've had to reboot my NAS. I tried to turn off Channels app from control panel and Channels DVR won't load until I reboot. Has happened past few days on some beta updates. Happened again here.
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Updated to latest prerelease and it's working now! 
I tried deleting and re-adding the Optimum TVE source and same issue with NFL Network.
055f4045-d5ca-4885-b015-94cd0ee81ca3
Got it working during half-time. Thank goodness, that NFL app is garbage, was at least a minute behind, and kept dropping out.
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Hulu live and NFL network stopped working , {Playback Failed} seems this is happening with others too.. Must be a product of TVE
RE: NFL Network gone
I decided since I've had some wicked crashes to try to reinstall from latest stable version manually and then update to latest. Interestingly, I uploaded stable (MyCloudPR2100_OS5_ChannelsDVR_1.0.7.bin) and then went to re-add NFL Network. It spun for awhile but re-authenticated NFL Network without uploading to your fixed version and it worked as is.
EDIT: I updated to 2021.09.17.0006 and NFL Network didn't work after update. Did a rescan and it's now working again. Looks like I am good to go!
Latest logs:
f4cc599f-399a-4049-84ca-23135d555e87
150d90d0-4ec4-4b7f-9fc0-92e3ba13e700
I have the same problem with HULU Live login. Tried upgrading to the latest DVR Prerelease and rescanning the NFL channel. It gave me a "Content Deadline Exceeded" error. I am able to login (using my HULU login) and watch from the NFL website.
Fwiw, NFL Network is working for me with slingtv and v2021.09.17.0006, but I had to rescan for the channel in the lineup.