Results may vary depending on the audio interface. The way I have my audio inputs set up, my microphone is my second input and not my first which is what seems to have been causing the issues (at least in my case.) I literally just unplugged my microphone cable from my second input and moved it to my first, and that seems to have made it all work. I have not currently found any solutions to this problem, but will keep looking. Unity (or at least the version of unity that BattleBit is running off of) is not capable of reading multiple audio channels from a sourced input. This is apparently a bug within Unity itself and not specifically BattleBit.

Scarlett 2i2, MOTU M2, etc.) will sometimes have this problem. I have looked into this problem a bit, and on their discord, I have discovered that apparently users who utilize a multi-channeled audio interface (i.e. If anyone knows what's causing this, you will forever be in my debt. What I haven't tried is changing the configuration files for voice chat, but I cannot find them. I have already done the standard troubleshooting BS: But I can not find any other report of this issue outside of BattleBit. I did not have this issue before my steam client updated the other day. No matter what, game output is sent with my voice chat input (I can still talk just fine).

I have tried multiple sets of mics w/ speakers, headsets, and even a virtual audio cable to simulate an input device. Whenever I use voice chat, all game audio (ambiance, sound effects, other players talking over VOIP, etc.) is played directly into my input device. All my other games and services don't do this, and I cannot find a fix.

Voicemod soundboard test