The most common reasons for a game to not start in a tournament are delays. Usually tournaments are on a very tight schedule and just small interruption might delay the whole day with minutes. If you purchased an all access pass, you can always find the game before in the schedule and check if it is still live. You can also check the tournament schedule and see if the game before has a reported score.
There might be reasons for games not being streamed or published as replays in a tournament, such as injuries, something happening during the game, personal integrity i.e someone not wanting to be filmed or technical problems.