Do you know what can cause audio issues? I have no game audio and nothing is muted. Are there any audio drivers that you know will not play your game's audio? If so, could you list them, and any other potential fixes?
Maybe one of these posts can help you:
https://steamcommunity.com/app/255710/discussions/0/135511027320265206/
https://forum.unity.com/threads/no-audio-in-unity-games.532872/
Are you sure the game is not muted? Check the windows audio mixer:
https://forum.airportceo.com/t/solved-no-audio-sound-anymore/10852