I was able to find a way to make this work by changing the BIOS settings. It's not ideal, because I have to change it back in order to use the docks we have at the office, but it does work. Here's the BIOS setting I changed: F12 during startupBIOS SetupIntegrated DevicesVideo/Power only on Type-C Ports I also tried with the same cable on a different monitor. On a P2715Q, I still got messages about the USB device not being recognized, but I did get full 4k resolution. Not sure what to make of that. With the BIOS setting above it worked without the USB warnings.  
I just got a new work laptop. It's a Latitude 5520 - 11th Gen i7-1165G7. Windows 11.  My old laptop is a Precision 5510 and it's connected to my U2713HM by a USB-C to Display Port cable at QHD with no issues. It's still on Windows 10.  When I try my new one, it repeatedly says "USB Device not recognized" and the display only goes up to 1080p. I think that means it's downgrading to USB 2.0, but not sure why or how to confirm.  The U2713HM does not allow full resolution through the HDMI cable, so I'm stuck with USB-C.  I updated the drivers that were available for the laptop through Dell's site.  Is the monitor just too old? Could it be the cable? Something else I'm missing?
Latitude 5520 only gets 1080p on U2713HM monitor over USB-C to Display Port 
cable