The native GH integration is quite limited in the types of devices it can bring over to GH -- it's basically just bulbs, switches and plugs.
Unfortunately, there's no warning when you an ineligible device to your list for the GH integration, so you only find out the hard way (it just doesn't work).
IIRC, if you go back to your GH integration list in HE after you attempt to sync, ineligible devices will be dropped out of the list. But it's been a while since I've done any of this, so not 100% sure.
The community-developed GH integration app allows for a much wider variety of devices to be added - you may want to check it out.
[Alpha] Community-maintained Google Home integration - 
Developers - Hubitat
