Thanks for posting!
Looking at the specifications for this specific HP system, I see that the USB-C port does not support USB-C video nor Power Delivery for charging:
1 USB 3.1 Type-C™ Gen 1 (Data Transfer Only, 5 Gb/s signaling rate)
Because of this, we consider this system to be incompatible as the “HDMI 4K” port and host charging through the dock will not work. If one of the monitors that are not working is connected to this “HDMI 4K” port on the dock, then I’m afraid this will not function through your system.
However, the DisplayPort outputs on the dock should still work as expected. If these outputs are not working, we could be dealing with a DisplayLink driver issue. Let’s reinstall this driver to see if that helps restore the DisplayPort outputs:
- Disconnect the dock from the system and please remove the power cable from the dock so it turns off completely (this is important so the unit resets). Please keep it disconnected until the last step
- Uninstall any and all software with ‘DisplayLink’ in the title that is present from within the Control Panel -> Programs and Features. Don’t worry if these entries are not present or if the process does not work, just move onto the next step
- Download, extract and run the DisplayLink cleaner tool (https://s3.amazonaws.com/plugable/bin/DisplayLink/DisplayLink+Installation+Cleaner+9.1.1462.exe)
- Once the Cleaner has been run, reboot (even if not prompted to)
- Now download and install the 9.2 M3 DisplayLink software (https://plugable.s3.amazonaws.com/bin/DisplayLink/DisplayLink+USB+Graphics+Software+for+Windows+9.2+M3.exe)
- Reattach the power cable to the dock first. Once the dock is powered on, reconnect it to your system which will trigger the final portion of the installation
Thanks for giving us a chance to help!