I am trying to record H1Z1: KOTK with OBS Studio but my audio isn't going through OBS Studio, just my microphone audio. I have set an Audio Output Capture to my Earphones that I am using to listen but I still get the issue. My headset is a Razer Kraken 7.1 Chroma.
OBS is not picking up game audio since the audio mixer is set all the way to the left. Drag the slider for Desktop Audio all the way to the right, or at your desired volume. That will allow your OBS to capture the game audio.
I did some digging online and Razer Synapse can sometimes mess around with OBS. Try closing out of Razer Synapse processes and/or disable Razer Synapse on start-up and restart your computer.