Binary_sensor not triggering automaiton

Configuration
1

I have the following rest binary sensor:

- platform: rest
  resource: http://192.168.0.100_etc/sensors/15
  name: living_room_motion_sensor
  value_template: '{{value_json.state.presence}}'
  scan_interval: 1

And the following automation:

- alias: 'Motion'
  trigger:
    platform: state
    entity_id: binary_sensor.living_room_motion_sensor
    to: 'on'
  action:
    - service: notify.ios_robins_iphone
      data:
        message: 'Motion detected'

Sensor is working, detecting motion and changing the state, entity_id correct etc. However the automation is not being triggered - what is wrong?

UPDATE: Using the automation editor, got it working with:

  trigger:
  - entity_id: binary_sensor.living_room_motion_sensor
    from: 'off'
    platform: state
    to: 'on'
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