Sonos automation select Source via data_template not working

Configuration
1

Hello ,

I am trying to dynamically set the source of my sonos one depending on a state given by a magic cube.
The automation doesn’t throw any errors. But it does not change the source of the media player. I have already added the stations as favorite in sonos app.

Any suggestions?

Here is the part that does not work.

- alias: Magic Cube Kueche Musiccontrol
  initial_state: true
  trigger:
    - platform: state
      entity_id: sensor.magiccube_kueche_faceup
  action:
    #    - service: media_player.turn_on
    #      entity_id: media_player.sonos_kuche
    - service: media_player.select_source
      data_template:
        entity_id: media_player.sonos_kuche
        source: >
          {% if is_state('sensor.magiccube_kueche_faceup', '1' ) %}
          "Superfly.fm"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '2') %}
          "BFBS Germany"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '3') %}
          "Deluxe Lounge Radio"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '4') %}
          "80s Flash"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '5') %}
          "German Zeitgeist"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '6') %}
          "pure fm Hamburg (House)"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '7') %}
          "Cruise Control"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '8') %}
          "Rare Grooves"
          {%-elif is_state('sensor.magiccube_kueche_faceup', '9') %}
          "Concert Hall"
          {% else %}
            "Superfly.fm"
          {% endif %}
2

are this sources in your sonos favorites?

my script looks similar

sonos_radio_superfly:
  alias: 'Sonos: Radio SuperflyFM'
  sequence:
  - service: script.sonos_join
  - data:
      entity_id: media_player.wohnzimmer
      source: 'Radio: Superfly.fm'
    service: media_player.select_source
  mode: single

But I have “Radio: Superfly.fm” as a favorite in Sonos

3

Yes I have added all the cases as favorite in sonos.

I have found a similar issue with no solution.