FYI - something worked
I think this thread was helpful,
https://support.plugable.com/t/ud-cam-is-not-working-with-mac-book-pro-13/19634?u=sam9
I ran the MacBook system restart mentioned here, and then I removed and re-added the device.
1.) I deleted the device/“selected service” on the Mac Network Preferences
2.) Then I re-added a new device in Mac Network Preferences “+”, gave it a name “Plugable UD-CAM” and selected USB interface 10/100/1000 LAN
All set, thanks!