I am using this dock with a 16 inch MacBook Pro and two Acer V277U monitors. One monitor is connected to the DisplayPort and works fine. The other monitor is connected via HDMI and is not working. While the monitor is recognized by macOS, there is no picture (blank screen). I tried all suggested resolutions to the other post here (restarting dock etc) with no success.
Just to confirm the monitor/cable/Mac is working as expected, I can confirm that I am able to run both monitors if I use a secondary USB C to HDMI adaptor for one of the monitors and the DisplayPort on the dock for the second monitor.