Nice camera, could check the basics swiftly when connected directly to the computer running Kstars, however that thing will not connect when connected to the RbPi4, running the latest astroberry release, 2.04 I believe….
I have the same cam and it works perfect with 2.0.4. Select ToupCam driver, check the power of rpi4 it should be 3A or higher or try power from usd-c from another good supply. If cam connected via hub - it should be powered as well.