Great!
I can control my switches via Google Assistant via Google Home - they are switches like any other. Just follow the setup docs. I use the manual config rather than nabu casa but both work.
Also if you add more switches, make sure they have a different topin… (ie don’t use sonoff again)
Ok, a question and an observation about your tasmota device :
question : what .bin did you flash? Not all .bin’s support autodiscovery
observation: your full topic is wrong.
Once HA has seen the device, the device name won’t change even if you change the friendly name.
IF you use MQTT Discovery, the full topic should be set to:
%topic%/%prefix%/
IF you DON’T use MQTT Discovery, the full topic should be set to:
%prefix%/%topic%/
Tasmota will set these AUTOMATICALLY when you enable discovery but will not reverse it if you turn discovery off - you need to do that yourself.
The problem is homeassistant uses the homeassistant prefix for discovery messages. Now you use it for normal operations. It does not matter much for you since you only have 1 tasmota device. But each time a message arrive, HA tries to discover before HA realizes it is for a regular device. Once you reach more than 1 device you will start noticing the lag.