When I try to add an automation in Google home, there is only one trigger showing as "detects events". When I press on this, there are no options and now way to move on to create the trigger (see screen grab). I had assumed I would be able to use the doorbell ringing as a trigger, as there were lots of posts in the forums for other models doing that. 

I can't see any settings I can change and it all works fine in the tapo app and with the associated chime. 

Does anyone have any suggestions? Thanks