I also tried to access the red button via my Tivo box on channel 513, Sky Sports Football just after 3pm as it was advertised.
It goes one moment and goes to a sky sports football screen please wait ...
After about a minute it says Channel unavailable - Unable to tune in to the channel - Please try again later.
I did reboot the Tivo box. But just the same.
It has worked in the past, but not today, I was looking forward to watching a game.
Do let us know what the problem was and when it would be fixed