Triggering an automation off a helper sensor?

Configuration
1

Hi.

I have a device with attributes. I have a helper sensor that extracts one of those attributes.

sensor:
  - platform: template
    sensors:
      spotprice:
        value_template: "{{ state_attr('sensor.opennem_qld', 'price') }}"
        friendly_name: "QLD Price"
        unit_of_measurement: "$/MWh"

I have an automation that I am trying to trigger off that helper sensor, but it doesn’t work. I’m not sure how to debug?

alias: Stop charging at $50
description: ""
triggers:
  - entity_id:
      - sensor.spotprice
    above: 50
    trigger: numeric_state
    for:
      hours: 0
      minutes: 0
      seconds: 1
conditions: []
actions:
  - type: turn_off
    device_id: 51c582b0c75bfa04e7d8af6bb14d0109
    entity_id: switch.shellypro2_ec62608fa31c_switch_1
    domain: switch
mode: single
2

You don’t need a template sensor for this. The numeric state trigger supports attributes.

alias: Stop charging at $50
description: ""
triggers:
  - trigger: numeric_state
    entity_id: sensor.opennem_qld
    attribute: price
    above: 50
    for:
      hours: 0
      minutes: 0
      seconds: 1