If I want to search for a movie or a show it only brings me to YouTube. So if I hit Netflix on my Samsung remote, then hit the mic button and say "Adam Sandler said movies" it only brings me to YouTube clips. Nothing else. I used to be able to search this on my firestick.
If I use my tv providers search assistant it brings me right to the movie, but I prefer not to use that 3rd party app.
I usually get a pop up saying "this function isn't available with the current setting" or it will just go to a YouTube app