There is a recording page that lets you adjust bitrates and set microphone to BOOST or to record mic or not or to record audio or not i suspect. But it may be that game might have a unsupported audio codec is a small unlikely possibility. Or maybe your computer doesnt have audio codecs installed. If youre on a build of windows insider you may need to roll back to regular windows as sometimes its insider registry flags and 'diagnostics info and telemetry' doesnt get received so they dont let some functions and limit gaming performance like its unactivated or the ISO of some insider builds dont come with windows app store and other things by default.. also reinstall adrenaline and ensure no error codes on the FINISH button page. you may need certain visual C redistributables from microsoft website or the newest .net runtime. get all your audio/video codecs from microsoft corp on the windows app store most are free. also check your windows audio mixer and ensure your soundcard doesnt require you to select an audio mixer channel as the recording option.