First time I ran the game the audio was working fine, the temporary fixes mentioned below only fixed it for 1 launch, after that it stopped working again.

Had it fixed temporarily 2 times: once by reinstalling the game, once after verifying the game files for 3 times. Verifying the game files doesn't fix it anymore. I'm not going to reinstall the game every time I want to play.

Windows 10 64bit
Game is installed on an external SSD which is connected via USB(all other games on that SSD work without problems)