So after a few minutes I realized I needed to log into the camera itself and turn on Audio. I followed these instructions
https://reolink.com/faq/set-audio-for-reolink-cameras/ and also turned it on under basic settings to the right of the main screen video display. Now my
Blue Iris records audio, but doesn't play audio live. Which is fine for my purposes.
However, my camera doesn't seem to trigger very well on blue iris. Do you have any trouble with this? I've got the settings turned up so that it should trigger on just about anything, but it just seems to not trigger often when there is plenty of motion or sound.