Anyone have any luck displaying a Precision 7530 (Win 10 pro, i7 8750H, P1000 graphics) on a U2520D monitor or equivalent through USB C?

When selecting USB C on the monitor, it goes through "Scanning for signal..." and ends up with "No USB Type C signal from your device". A USB camera and USB mouse plugged into the USB A ports do work. Also in the Windows Advanced Display Settings page, the monitor appears as "Display 2: DELL U2520D" with Display Adapter Properties listed as "Display 2 isn't active". Same result when trying screen modes Duplicate, Extend or Second screen only.

Things I tried:
7530 HDMI > U2520D HDMI - works
7530 USB C > HDMI Dongle > U2520D HDMI - works
Macbook pro 13 (2017) USB C > U2520D USB C - works
7530 USB C > U2520D USB C - only data, no video

Using the USB C uplink port on the back of the monitor, and either of the thunderbolt ports on the left side of the 7530. Also using the USB C cable that came in the U2520D box, labeled "Type 3 Gen 2 5A PD3". 7530 is plugged into AC mains.

Went through Monitor technical support, they thought it should work so sent me to Precision technical support, who thought it shouldn't work so sent me to Monitor sales. Sales was convinced that the 7530 was on the plug and play compatibility list for USB C for the U2520D and suggested I try technical support.