The issue was the physical connection. Even if HDMI can transport also audio, the integrated camera needs a USB cable
Hello, I have the  P2418HZm connected to the Precision 5550 using a docking station, all official components from Dell. The camera integrated in the P2418HZm is not recognised. Only the Precision 5550 webcam is shown. I have installed all the drivers but nothing changed. What can I do to resolve or understand the cause of the issue?
Precision 5550, dock, P2418HZm camera not working