Changing rest icon with value

Hi, I have this code and the icon of my sensor doesn’t change when the value changes

rest:
  - resource: http://192.168.100.207/getVariables
    scan_interval: 5
    
    sensor:
      - name: "Status"
        value_template: "{{ value_json.Status }}"
        unique_id: "rgbclockStatus"
        icon: >-
          {% if is_state(value_json.Status,"ON") %}
            mdi:lightbulb-on
          {% else %}
            mdi:lightbulb-off
          {% endif %}

This is what my rest call returns:

{
  "Status": "ON",
  "Mode": "Clock12",
  "Selected_Effect": "SolidFill",
  "Parameters": {
    "Color1": 255,
    "Color2": 170,
    "Brightness1": 150,
    "Brightness2": 50,
    "Effect_Speed": 1
  }
}

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