Game was on when I tried to see it in firefox, sound yes, but no video.
You get m3u8 with one of many sniffers like urlsnooper, httpfox or hls stream detector extensions for firefox,etc.
You can play m3u8 with vlc however you like if there are no other parameters needed.
This has to be looked at.
Hls stream detector gave me ready to use ffmpeg command, didn't work either.
I forgot to try livestreamer command, it would be compatible with streamlink.
There is one news channel that I can watch with VLC 3, but not with any other VLC older than VLC 3.
http://nightlies.videolan.org/
Streamlink plays the same m3u8 with whatever VLC i throw at it .
6pm your time is 2am here, I go to bed soon, but anyway If I do the same thing result is the same.
Solution would be to try some new trick.