Google Assistant currently only supports a small number of functions, by assigning one of the following Tags to Items.
[“Lighting”]
[“Switchable”]
[“Blinds”]
[“Scene”]
[“Outlet”]
[“CurrentTemperature”]
[“Thermostat”]
None of your items are of the right type, nor have Tags.
To control your Sonos devices, you probably want to be utilising the Sonos direct integration with Google, as opposed to going through openHAB via Google.
Thanks. Useful info. So Assistant voice control is very limited? That isn’t clear from all the info I’ve ploughed through!
I only used Sonos as an example to get the system up and running.
My real aim is to get a squeezebox system working (but at first sight, it seemed much more complicated!).
There was an excellent beta Alexa skill which was working well with squeezeboxes (but sadly, the developer has disappeared, and the skill has become defunct).