Universal Media Player - HomeKit - No Mute Button

Hello,

I am still quite new to Home Assistant.

I use a Harmony Hub to control my TV and Nvidia Shield. For this purpose I have created a Unisversal Media Player and configured it accordingly.

I have the media player in HomeKit as accessory.
The player also appears in Home but the mute, play and stop button does not appear.

Maybe someone has an idea?

Here is my config:

HomeKit

homekit:
- port: 55704
  name: Home Assistant Bridge
  mode: bridge
  filter:
    include_entities:
      - switch.mute_harmony_hub

- port: 55604
  name: Harmony Media Player
  mode: accessory
  filter:
    include_entities:
      - media_player.harmony_media_player
  entity_config:
    media_player.harmony_media_player:
      feature_list:
        - feature: on_off
        - feature: play_pause
        - feature: play_stop
        - feature: toggle_mute

Remote

remote:
  - platform: harmony
    name: Harmony Hub
    host: 192.168.178.35
    activity: Shield

Media Player

  - platform: universal
    name: Harmony Media Player
    attributes:
      state: remote.harmony_hub
      source_list: remote.harmony_hub|activity_list
      source: remote.harmony_hub|current_activity
      is_volume_muted: input_boolean.harmony_hub_muted

    commands:
      turn_on:
        service: remote.turn_on
        entity_id: remote.harmony_hub

      turn_off:
        service: remote.turn_off
        entity_id: remote.harmony_hub

      volume_up:
        service: remote.send_command
        entity_id: remote.harmony_hub
        data:
          device: "Samsung Verst\u00c3\u00a4rker"
          command: VolumeUp

      volume_down:
        service: remote.send_command
        entity_id: remote.harmony_hub
        data:
          device: "Samsung Verst\u00c3\u00a4rker"
          command: volume_down

      volume_mute:
        service: switch.toggle
        entity_id: switch.mute_harmony_hub

      select_source:
        service: remote.turn_on
        data:
          entity_id: remote.harmony_hub
          activity: '{{ source }}'

Switch

# Input_boolean_mute"
      mute_harmony_hub:
        friendly_name: "Mute Harmony Hub"
        unique_id: "mute_harmony_hub"
        value_template: "{{is_state('input_boolean.harmony_hub_muted','on')}}"

        turn_on:
          - service: input_boolean.turn_on
            data:
              entity_id: input_boolean.harmony_hub_muted

          - service: remote.send_command
            data:
              entity_id: remote.harmony_hub
              device: "Samsung Verst\u00c3\u00a4rker"
              command: Mute

        turn_off:
          - service: input_boolean.turn_off
            data:
              entity_id: input_boolean.harmony_hub_muted

          - service: remote.send_command
            data:
              entity_id: remote.harmony_hub
              device: "Samsung Verst\u00c3\u00a4rker"
              command: Muteor paste code here

customize

  customize:

    media_player.harmony_media_player:
      device_class: tv

Entity

Many thanks in advance