Sonos_join is not working as expected

Configuration
1

I would think this automation should work, but it doesn’t.
My intention is to group the Sonos BEAM, which is connected to Apple TV and playing TV sound, but when Apple TV is in the state idle Beam should rejoin (Sonos_join) the group in which media_player.kjokken is the master.

Somehow this does not work…
Any suggestions on how to accomplish this or is there an error in my code that I don’t see?

- alias: '[SONOS] - Sonos BEAM to group'
  description: Add Sonos BEAM to group when Apple TV is in state IDLE
  trigger:
    platform: template
    value_template: "{{ is_state('media_player.apple_tv_stua_1_etg, 'idle') }}"
  action:
    service: media_player.sonos_join
    data:
      master: media_player.kjokken
    entity_id: 
      - media_player.sonos_beam_stue_1etg
      - media_player.sonos_soverom
      - media_player.sonos_bad
      - media_player.sonos_kontoret
      - media_player.sonos_lekerom
2

It seems I had to change to the Sonos service as per Home Assistant release 0.93

*before* service: media_player.sonos_join

*after* service: sonos.join

Now it interferes with the Sonos grouping, but still not as I want; adding media_player.sonos_beam_stue_1etg to the existing group, mastered by media_player.kjokken

3

I ended up with this working automation, which sets the Sonos speakers occupied by Apple TV when TV is playing, back into the group with the speakers in the kitchen and others.

- alias: '[SONOS] - BEAM to group'
  description: Add Sonos BEAM to group when Apple TV is in state IDLE
  trigger:
    platform: template
    value_template: "{{ is_state('media_player.apple_tv_stua_1_etg', 'idle') }}"
  action:
    - service: sonos.join
      data:
        master: media_player.sonos_kjokken
      entity_id: 
        - media_player.sonos_stue_1_etg
        - media_player.sonos_soverom
        - media_player.sonos_bad
        - media_player.sonos_kontoret
        - media_player.sonos_lekerom