Pixel Watch won't connect to light or system

Just downloaded the app to set up my one hue light as it is a Hue Go and having to use the button on the bottom is a bit annoying.

I can set this up on my phone, but would ideally like to toggle it on/off with my watch.

When I search for a device nothing comes up. If I force stop the app it seems to sync to my phone setup but the toggle doesn’t work. I bought the wear os upgrade, but can’t see what that even unlocks. Also uninstalled and rebooted/ joined the beta etc.

I don’t have a bridge as it is my only hue light.