I've been using my Google to turn my lights on/off for over 4yrs now, I use it in English and Spanish, but the last 2 days is not following my "prende la luz" command, which means turn on the lights, and it replies me with "I'm sorry that VEHICLE is not registered in Google app"
So I tried to change the name on the app, and put luz instead light but didn't change.
I don't have any problem asking it in English, but there are people here who can't speak other than Spanish so it's a little bit complicated,
I haven't notice if that's the only word that Google can't understand!
I'm sorry to hear you're having some concern when controlling your smart lights. A few questions: does this only happen when controlling your smart light, in a non-English command? How about other commands to other devices? By the way, what Nest speakers do you have for us to isolate if it has something to do with your speakers? It would help a lot if you could do a sequential reboot by unplugging the power cord from your router followed by your Nest devices, then, your smart lights. Restarting your phone might also help.
Tell us how it goes.