having sound problems for second player

[disputegold]

Hey, I have a quick question about my problem with no sound for second user while hes in the same game as first user.
I am using a two-user workplace, and while both players are playing the same game - Dota 2 (steam game), despite having two different headsets, each assigned to one workplace in the app, one of them is not receiving any sound input or output in the game, despite having the correct input/output device selected; other peripherals work properly, and the second user receives perfect audio input/output from his game. When both users are playing different games, the audio is excellent on both sides.
Has anyone had the same problem or has an idea for solution?
Thanks a lot, disputegold