MQTT Instar 8015: Not able to add switch to enable areas

I have created some buttons and a binary sensor to control my camera via MQTT. This works and I am able to rotate the camera or move the camera to the different positions.
However, it does not work to create a switch (Wohnzimmer Kamera Area1) via which I could activate the monitoring of Area 1. I do not get an error message, but the switch does not appear in the entities either.
What am I doing wrong here?

Configuration.yaml

...
knx: !include_dir_merge_named knx/
mqtt: !include_dir_merge_named mqtt/
....

Instar.yaml

binary_sensor:
  - name: "Wohnzimmer Kamera Alarm"
    state_topic: "instar/instar-wohnzimmer/status/alarm/triggered"
    unique_id: 5650ce8b-1444-45e4-87e0-23e1ed62d0b2
    payload_on: "ON"
    payload_off: "OFF"
    device_class: motion
    value_template: "{% if value_json.val == '0' %}OFF{% else %}ON{% endif %}"

switch:
  - name: "Wohnzimmer Kamera Area1"
    unique_id: 30f199b2-a1b6-4d16-9f76-eb05b5e33c8b
    state_topic: "instar/instar-wohnzimmer/status/alarm/area1/enable"
    command_topic: "instar/instar-wohnzimmer/alarm/area1/enable"
    qos: 1
    payload_on: '{"val":"1"}'
    payload_off: '{"val":"0"}'
    state_on: "ON"
    state_off: "OFF"
    optimistic: false
    retain: false

button:
  - name: "Wohnzimmer Kamera Position1"
    unique_id: 3dbc679c-7751-4d87-84bf-c13d27e80503
    command_topic: "instar/instar-wohnzimmer/features/ptz/preset"
    qos: 2
    payload_press: '{"val":"0"}'
    retain: false

  - name: "Wohnzimmer Kamera Position2"
    unique_id: a2fb22e5-d644-45ee-8a11-01bfc724b068
    command_topic: "instar/instar-wohnzimmer/features/ptz/preset"
    qos: 2
    payload_press: '{"val":"1"}'
    retain: false

...

Can’t anyone here help me? Maybe @INSTAR