Lattepanda delta 3 not outputting display on USB-C display port (DP)

Hi,

As per specs of delta 3, it supports display port over USB-C.

I do have a monitor which supports DP over USB-C when I connected Lattepanda delta 3 with that monitor, no display showed up.

I must mention here that display works fine over HDMI interface between Lattepanda and monitor. The problem is when I switch to USB-C interface?

I am wondering, do I have to enable the video output on USB-C interface, somehow? Can anyone guide me here.

Thanks