S2718D, Logitech C920 HD pro webcam not recognized

When plugged in directly to XPS15 9560, works just fine. However, when XPS 15 9560 is paired with S2718D monitor (via USB Type-C cable), and cam plugged into the standard USB port on the monitor base, nothing.

I am successful in using the cam with a different laptop connected to the S2718D in the same fashion.

I reviewed all the available posts addressing similar question without an answer. Appreciate help.