Plugable Microscope Screen Black on Chromebook

I am having issues with the pluggable microscope on a Chromebook. I’ve been to the Privacy Settings and clicked on the Microscope. When I open the camera app, the chromebook recognizes the microscope and it turns on. However, nothing is showing on the camera app…only a black screen. Any suggestions? We’ve tried the microscope on a Mac and it works fine with the software. Thanks.