I have had Google Assistant working with hass for a long time. I have secure_devices_pin set, and Google “knows” about it…I can unlock my front door with voice and Google asks for the pin.
I recently exposed my MyQ garage door opener to Google Assistant and…I can’t open/close it, but I can ask Google if it is open, and it will respond correctly:
“Hey Google, is the garage door open?”
“The garage door is closed.”
However, attempting to open it does not work:
“Hey Google, open the garage door”
“Sorry, I am unable to process your request.”