I have the following setup

Laptop: Dell Precision 7730
Monitor: P3222QE

When I connect to the display via HDMI, the external display works. However, when I use the USB C cable which came along with the monitor, the display does not work.

I know the cable is not damaged because,

1. I am able to use the same cable to connect the same display to my Macbook Air (and even charge it).
2. I installed Dell Device Manager, connected display via USB-C and HDMI, opened Dell Device Manager and checked the box for matrix display. After this, I removed the HDMI cable and the external display worked for about 5 minutes. Now I do not even see the checkbox for matrix display

I would really like to use the display using USB-C and without having to buy a USB-C to HDMI converter. Would welcome any suggestions!