The last topic about this closed with “We can’t do anything, it’s the OS” (Testing/Beta players)
On my Android TV I can talk to it and tell it to play stuff in YouTube and my Goverment run Play-app (Sweden).
But Plex… noooo… If SVT-Play can do it so can you.
My Android TV is set to Swedish, but I can talk to it in both English and Swedish.
Google Assistant is available in Arabic, Bengali, Chinese (Simplified), Chinese (Traditional), Danish, Dutch, English, French, German, Gujarati, Hindi, Indonesian, Italian, Japanese, Kannada, Korean, Malayalam, Marathi, Norwegian, Polish, Portuguese (Brazil), Portuguese (Portugal), Russian, Spanish, Swedish, Tamil, Telugu, Thai, Turkish, Urdu and Vietnamese
https://support.google.com/assistant/answer/7172657?hl=en-GB&co=GENIE.Platform%3DAndroid