I'm having the exact same issue. The game appears to be picking up my audio but I can't hear it back... have tried all the sound settings changes that seem to be working for some people but nothing is helping. I did hear my "Hear Recording" once after changing the output from my headset to something else, and then switching it back, but this only worked once and hasn't again since. My friend has the exact same headset and audio setup as me and it's working no issues for them.