I have a mbp I use at work with usb-c connected displays . At home I have a dock that uses displaylink drivers for the screen .VMWare fusion works fine with these drivers, but parallels can't be made to work.
I'm on the latest Catalina with DisplayLink connected Hub with multiple displays and Parallels. I've tried a new installation of Windows 10, same results. I can get everything to work fine as long as I keep my MBP lid open. However if I start up MacOS then close the lid, then open Parallels nothing works. All it does is spin and nothing starts.