I am now also getting this error. Won't let me watch match previews or any of the 5 live matches either. Just gives the "The content is not available for viewing" message.
Mine is working, but the match details are missing, meaning i can click a random link and wait til it loads to see which match it is.
EDIT: And its stopped working again and back to that error.
The liverpool game was working for me momentarily, but now gone again.
It's annoying enough I only found out about this becoming a paid service when I got my first bill, the fact that it doesn't do the only thing it's meant to do is just crazy.
Similar issues for me.
On the game selection screen nothing is really loading properly.
When choosing a game (in this case Liverpool vs Palace, https://sport.optus.com.au/epl/play/20237) it either displays "The content is not available for viewing." in Chrome, or it loads the player, gives me the option to "Watch Live" and then doesn't load.
On Edge, it goes to the player, and nothing loads either.