Question / Help No Audio Output Devices Available

I've got my Blue Yeti microphone plugged into my Mac and OBS is picking up the input audio just fine, but when I go to select audio input devices, there are no options to select - no dropdown menu at all. What's the big deal?

Running macOS HIgh Sierra 10.13.4 on OBS 21.1.1

Used to run OBS on my PC, just got my Macbook.
 
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