I'm English and my wife and kids are french so naturally all our devices are set to french - our Google speakers do not understand my terrible french accent but bizarrely work perfectly when I speak English but only if I do a completely over-the-top french accent.
Same with Hindi. Needs a ridiculous English accent to understand Hindi. I call it the British Colonial Administrator accent. Like this guy - https://www.youtube.com/watch?v=V6_896OhnaQ
I don’t even attempt to talk to assistants in my native language because I know they’ll fuck it up. I just go straight to English.