Sonos turn_off, turn_on gives error

Hi,
I have a SONOS Era 100 player, which is found by Music-Assistant. I installed Sonos “addon?” for Music-Assistant. Era 100 is found, and plays sounds, volume +/- so “basics” work.
If I read entity media_player.wohnzimmer_3 (which is this Era), I see supported_features: 8320575 Which is nearly “everything”, as the bit pattern is 111111011111111111111111 if I am not wrong, only REPEAT_SET = 262144 is not supported. The ones that are not working are turn_on and turn_off which are in the “supported feature” list.

I went to developer tools, and choosed Mediaplayr: Off, but where not offered the Era 100, only the “NVidia Shield”, which I also have.

I tried to use this YAML

type: vertical-stack
cards:
  - type: custom:mini-media-player
    entity: media_player.wohnzimmer_2
    name: Wohnzimmer Sonos
    artwork: cover
    volume_stateless: true
    sound_mode: full
    shortcuts:
      buttons:
        - name: SWR 1
          type: mp4
          id: https://liveradio.swr.de/sw282p3/swr1bw/
          icon: mdi:radio
    hide:
      power_state: false
      source: true
      info: false
  - type: custom:button-card
    entity: media_player.wohnzimmer_2
    name: |
      [[[
        return entity.state === 'off' ? 'Turn ON' : 'Turn OFF';
      ]]]
    icon: |
      [[[
        return entity.state === 'off' ? 'mdi:power' : 'mdi:power-off';
      ]]]
    tap_action:
      action: call-service
      service: |
        [[[
          return entity.state === 'off' ? 'media_player.turn_on' : 'media_player.turn_off';
        ]]]
      service_data:
        entity_id: media_player.wohnzimmer_2
    show_name: true
    show_icon: true
    layout: icon_name
    styles:
      card:
        - padding: 12px
        - border-radius: 12px
        - font-size: 16px
        - background-color: var(--ha-card-background)

but get the same error (turn_off, turn_on) not supported with the Era. Does anyone have a hint, on how to use turn_off turn_onwith the Era, even if it is only going in “standby”, which I assume.

many thanks
Juergen

I do not think Sonos can be turned on and off as such.
They go into a sort of power save by themself after a period of being idle, but it is still not turned off.

Pretty sure I only use stop and play in my Sonos automations, so @WallyR is probably right.