I’m in the US and I still only have the four options. No device trigger.
It must be a beta app feature for now.
They likely changed the API and the Switches need a different GA tag. What do you have the Item tagged as to expose it to GA (i.e. the ga metadata)? Did you try “scene”?
See OrangeAssist - Google Assistant Integration
@michikrug , do you have any insight into this?