Sound Buttons Not Working?

[tjbjorklund3]

The buttons nor slider adjust the volume. The devices that I tested with are my phone and TV, which obviously has volume control.

    entity: media_player.spotify_myname
    icon: mdi:music
    artwork: cover
    source: full
    sound_mode: icon
    info: scroll
    shortcuts:
      columns: 3
      buttons:
        - name: Favorites
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
        - name: Test2
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
        - name: Test3
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
        - name: Favorites
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
        - name: Favorites
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
        - name: Favorites
          type: service
          id: spotcast.start
          data:
            device_name: XBR-75X850D
            uri: spotify:playlist:37i9dQZF1DX89EkrAT8Z6U
            random_song: true
            shuffle: true
    replace_mute: play_pause
    toggle_power: true
    volume_stateless: false
    name: Quick Music
    group: true