I am having the same/similar problem where once I start up battlefront II all of my pc audio stops working. I use an audio interface (Voice meter) to run my XLR mic through, and control app outputs. Something odd I noticed is that if I select the channel "A2" to be active (My speakers) It does output my audio and I can hear the game, however with "A1" is selected (My headphones) I cannot hear the audio through my headphones.
This leads me to believe that the source of the problem is within the games input/output selection, which happens to be non-adjustable.
Yes, my windows input and output are set correctly according to the voice meter channels. It is simply battlefront that messes up my audio.