Why is this automation not playing my Sonos favourite in the speaker group?

Can anyone help explain why this is not turning on the radio and playing my favourite? I checked, the Sonos Favorites entity is enabled. I try to run from the automation, no errors but no music:

alias: Music_morning
sequence:
  - service: media_player.volume_set
    data_template:
      entity_id: media_player.sonos_downstairs
      volume_level: 0.3
  - service: media_player.play_media
    target:
      entity_id: media_player.sonos_downstairs
    data:
      media_content_id: FV:2/1
      media_content_type: favorite_item_id
    metadata:
      title: JAZZ.FM91
      thumbnail: http://cdn-radiotime-logos.tunein.com/s31229q.png
      media_class: genre
      children_media_class: null
      navigateIds:
        - {}
        - media_content_type: favorites
          media_content_id: ""
        - media_content_type: favorites_folder
          media_content_id: object.item.audioItem.audioBroadcast
mode: single