I think the tournament feature only applies to daily tournaments.
I had a similar problem for Live matches. I ended up writing code to go through players archives to get the pgn for the individual games and write out to a combined text file.
It's a pain,
Sorry if this topic was already discussed, but I was not able to find it.
Is there reason, why details of Live tournaments can not be fetched normaly? For example I would like to get all games played in round 1 (https://api.chess.com/pub/tournament/1bleskov-turnaj-rp-achy-1642875/1), but the request finish with error.
My ultimate goal is to extract all games played for the tournament (including byes and no-shows games, which doesnt appear in .pgn export) and reformat it to import the results into Swiss-manager.