USB webcams not appearing as a source option

So, I'm new to OBS and this seems like it should be an easy question, but I can't seem to find an answer.

I have 2 external webcams that have USB connections, and I want to set them up as sources in OBS. I know that the computer is recognizing the cameras because they work in Zoom and Photo Booth, but when I create a video capture source in OBS and click on the drop down menu where the cameras should appear, there is simply nothing there. Any ideas what I'm doing wrong?

Thanks in advance!
 
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