Ring alarm via MQTT triggering


I have successfully installed the Ring Alarm integration via MQTT and can set the alarm (even via automation).
Now I want to trigger the alarm via sensors (which are not loaded via Ring) with the following automation.
However, the triggering does not work.

- id: turn_off_alarm_in_morning
  alias: Test
  description: Test
  - platform: time
    at: '13:35:00'
  - service: alarm_control_panel.alarm_trigger
    entity_id: alarm_control_panel.dreieich_alarm
  mode: single