To be able to send a Video Signal over a USB C port the notebook needs to have support for DisplayPort Alternate Mode. Did you check if DP Alt Mode is supported by the HP pavilion 15-cw0509sa … (I coud not find it oinline)
Also you said you have 2 screens, how do you connect the other ?
If you click on the link to the specifications and scroll down to the external connections section you will see that the system supports Display Port 1.2, although I don’t know if this means that it is DP Alt Mode compatible. The other screen is connected via HDMI.