Camlink 4K blank screen on MacBook Pro
This answer is coming really late, but I ran into the same problem and found an easy solve. It seems that the problem comes from the camlink + Sony combo requiring more power than the computer wants to supply through its USB 3.0 port (max of 900 mA), so I used a powered USB 3.0 hub that way I am not relying on my Mac to power the Cam Link.
Here's the cheap powered hub i got at walmart. https://www.walmart.com/ip/onn-AC-Powered-USB-3-0-Hub-with-4-USB-Ports/325592700