Surface dock 2 not connecting to monitors using usb-c cables

Surface Laptop 3 and HP 27f monitor. Fantastic connecting over USB-c and 1.5m cable from iTec.
All refresh rates work, all admissible screen resolutions, too. 

Dock2 installed properly. Audio, Ethernet, USB, LAN - all functioning.

Monitors? Issues as everyone described - unbelievable.
I installed Displaylink. Used with another HP docking station. Excellent results. Unistalled it again.
Uninstalled even Kaspersky KTS . No difference. 

The only walk around was 75Hz for external monitor configured in the USB-c of Surface Laptop and extended view.

Afterwards I switched the cable into the Dock 2.
Firmware 5.19.139 . Tests give all a pass. 

I also opted out from DFCI management in UEFI. see this Intune management of Surface UEFI settings - Surface | Microsoft Docs 

Something looks like hardware issue imho. I will wait one more week and return the doc2 as unsatisfied customer of MS. 
Other ideas are welcome.

I have noticed you need to have the dock connected with the wire pointing towards the track pad.  On the old dock this did not matter.  I don't know what's up with this issue but surface to surface doc 2 connection  is directional for monitor support.  direction does not matter for any other usb connections.

I cannot believe this cured my issue - the connector lights up either direction however and all seemed well until I purchased a USB-A keyboard/mouse and used the (2) USB-A connections on the dock; both would work for a few seconds and then just stop or not work on bootup.  I'd also been receiving random pop-ups indicating "a device" may not be receiving enough power - none of the devices connected to the USB-C ports require power.

Note:  the additional dual monitors never had an issue connected to the USB-C ports, and even when the USB-A keyboard was connected directly to the Surface Laptop 3 notebook it would not function when the power connector cord was not pointed toward the trackpad.  As the dock connector appears to work either direction I am a little stunned that it matters with the Surface Dock 2 and did not with the original Surface Dock.

I just spent over an hour with Windows updates, driver updates, etc. for such a simple fix.  Microsoft, if you see this, please key the dock connector in some way that it is easy to tell when it is plugged in backwards.  Having it partially functional makes troubleshooting extremely difficult!

I had the same issue, and tried all the suggestions on forums like turning the laptop connection through 180 degrees and using usbc to hdmi adapter. 

I was using my previous hdmi cable that had ferrite noise suppression cores on it and thought I'd try another newer cable. Bingo! 

Fired up straight away! My assumption is that it wasn't compatible with the older hdmi cable or the ferrite cores were blocking the monitor discovery signal.

I purchased a high-end cable and not go.  I can see my monitor but the display manager doesn't work. I have 0 issues when connected directly to my laptop to the monitor but I specifically purchased the docking station from Microsoft so I wouldn't have to do this.  Microsoft....the gift that keeps giving.

Also, I initially used the cables that came with the monitor and tied different connection options.  I could see the monitor but just couldn't use the display manager.