I looked up the specs on your laptop. You can have two monitors but only one can be usb-c. The other one has to be HDMI. You have other usb-c ports but they can't be used for video. Also, when this is all set up check the bios for a muti monitor setting.
I assume you have tested both monitors individually using the known good USB port? If so, have you loaded the card manufactures drivers? Windows drivers will sometimes, but not always, only allow one monitor. If you have the NVIDIA? drivers loaded go to the NVIDIA setup program and see if dual monitors are enabled. In there you can click on "Detect". Also check that your monitors are set to detect USB and HDMI or set them both to auto. I hope some of this works.Any reason why the HDMI input would not be responding? The monitor is not even attempting to power cycle whereas before when I was trying to use both USB C ports it was.
I haven't messed with the BIOS yet, looking that up now.
UPDATE: I did some google searching and went into BIOS under advanced settings and I didn't see any option to enable any kind of multiple monitor display.