Start a timer with a given number of minutes / dynamic duration

Hi!

I’am trying to create a timer by adding a number input with a slider to ajust the minutes and a button to start the countdown. The number input is typ float and therefore i get 22.0 (e g.) instead of 22. So i have to convert the input to int. This is my approch, which does not work:

The timer works fine when i hardcode the duration. What do i missunderstand?

- type: custom:mod-card
  style: |
    ha-card {
      margin-left: 7px;
      margin-right: 7px;
    }
  card:
    type: vertical-stack
    cards:
      - type: markdown
        title: Music Timer
        content: Test
      - type: button
        name: Start Stop Timer
        icon: mdi:power
        show_name: false
        show_icon: true
        show_state: true
        tap_action: 
          action: call-service
          service: timer.start
          service_data: 
            entity_id: timer.musik_timer

            # Conversation to String "00:30:00" fails:
            duration: "00:{{ (states.input_number.timer_minutes.state | int ) }}:00"

            #  hardcoding works:
            # duration: "00:30:00" 

      - type: entities
        entities:
          - entity: input_number.timer_minutes
            name: Countdown in Minuten
          - entity: timer.musik_timer
            name: Timer

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