Pixelbook Go Atlas hdmi out/secondary display support?

I have just installed Windows 10 on my Pixelbook Go (Atlas - i5-8200Y). All working well, I have bought the Coolstar sound drivers and those work great.

But I can’t seem to get hdmi output / secondary display to work. I have tried a couple of dongles with no luck. Am I missing a driver for this, or is it never going to work?

I am completely confused about this issue, as I can’t find mention of it anywhere else. Is this a graphics driver issue, or something to do with the usb-c ports?? The hdmi audio is obviously also not working.

I’m disappointed with the lack of support here. After paying for the sound card drivers etc. I find out that hdmi / secondary display support doesn’t work on Windows for Pixelbook Go.

Please update the compatibility chart to show that Pixelbook Go on Windows doesn’t have external display support. If I had known this beforehand, I would not have gone through the install process.