That's cool. However I would like to also suggest you check out The Kister Method because that allows for such YouTube livestreams to play natively in Channels, no need to switch out to the YouTube app. Here's the URL you'd use instead:
https://kister.net/mpl/yt2m3u8?v=h3MuIUNCCzI
This works thank you.
How do we handle the case where the streamlink call is different on ios vs tvos, but we want to use it on all our devices?
I tried adding both at the same time, but with different channel numbers, but the server only seems to allow one at a time.
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edit: found answer here
use unique channel-id
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But it is very nice to be able to use this on the apple tv.
One note for others following.
The NFL app on apple tv is also finicky like the NBC app and may need to be restarted or closed in the app switcher in order for the nfl network and nfl live channels to show up.
Wow! That works even better. Thanks!
May I ask what you did? I must be missing something as I just see "got http response code 503" on all of these channels from apple tv. I also have the NBC app and the streams work fine from the app.
Thank you!!!! I did not have the beta version and now that I do it is working well. Even though like many I am disappointed in NBC, I am also equally thrilled how you so quickly brought in a workaround to lessen the pain a bit.
So, are you saying this method won't work with only the Pre-Release server version? Is that why I'm still getting a 503 error in both iOS and tvOS because I'm not using the TestFlight beta?
Yes
Does anyone know how to go directly to a Spectrum channel? Every number I add to the end of the link, gives a message that I am not subscribed to that channel, and it defaults to the last channel.
I'm not sure how to get these numbers, but this is what works for spectrum app:
if there are specific channels you want I can look them up
For DirecTV STREAM:
For Fubo:
#EXTM3U
#EXTINF:-1 channel-id="SPECTRUMTV" channel-number="111111" tvc-guide-stationid="45399",SPECTRUM NFL
spectrumtv://watch.spectrum.net/livetv/
#EXTINF:-1 channel-id="NBATV" channel-number="111112" tvc-guide-stationid="45399",NBA TV
nba://nba.com/watch/nba-tv
Has anyone got the NBA App opening up on tvOS? Thanks.
Sorry, one more thing:
It would make sense to have a way to enable an automatic collection for everything at a source, given this work. Going back/forth and adding to a collection when you make changes to streamlinks is a PITA.
Is there a link for SNY? Or could that be loaded through the NBC app (as a NBC RSN)?
Would this work for MSG?
Believe SNY split away from NBC app when they rolled their own app out.
Better chance to route it through a provider app (fubo, spectrum, etc)
This is one of the more interesting threads.
Trying to figure out where to jump back in
(Is it time to use docker) or can the above be done in webui (windows) played back iOS channels app (tv iPad iPhone)…
Is it possible a short video of it in action?
Or at least screen caps
Then finally compile step by step simple instructions to achive —- this result——(insert video or screen cap)…
If I may this seemed to work (community wise) as envisioned?
An issue, posts
more data surrounding said issue
Thoughts or ideas
Becomes a suggestion
Someone tries it (aka workaround)
Now we are this..
Well done all
Like I said one of the more interesting threads you can watch the evolution happen..
Thank you all
There are screenshots in the first post.
well as Homer would say DOH! thanks and sorry about not going all the way back... 
Try gametime://
MSG doesn't have an app on Apple TV