usb-c docking station not recognizing second hdmi monitor

I just got my usb-c docking station. I have two monitors connected via hdmi. One in the 2k hdmi socket and the other in the 4k hdmi socket. Only monitor connected to the 4k hdmi socket is recognized by my laptop (dell xps13).

What am I doing wrong?

I am sorry for the confusion, I installed the displaylink drivers and everything is working!

Glad to hear that worked out Dale!