sometimes in situations like this voice command is not perfect, you need to live with it or find a work-around.
In a particular situation I have, both Alexa and Google Home have a problem with a particular tunein station's; call letters; they both try to pronounce it rather than say the letters. In the case of Google, if I say play station KUSC, it says can't find station KUNC, In other cases it pronounces station kusk (like tusk) So to get around this hassle I just ask it to play kusk (the word, not the call letters) and it works and plays the station!