TTS on intent script?

How to use TTS service on an intent script?

This …

  ciao:
    action:
      service: tts.google_say
      data:
        entity_id: media_player.speaker_1
        language: it
        message: "Salve! Io sono Home Assistant!"

… is my script and I saw that it’s correcly fired but I don’t ear anything from the speakers!

If I call the service from the “dev tools” all works fine and I can ear the message.