DNS IP notification not working

Configuration
1

I have a dual WAN failover/failback set up in my router. I would like to be notified when the main WAN goes down. so I set up the DNS IP component. It is working and shows my public IP and when it changes.

However I never receive the following notification:

- id: dns_notification
  alias: 'DNS Change Notification'
  trigger:
    platform: state
    entity_id: sensor.myipopendnscom
  action:
    service: notify.iphone
    data_template:
      message: 'Public IP changed from {{ trigger.from_state.state }} to {{ trigger.to_state.state }}'
      data:
        push:
          sound: "Attention.wav"

I can receive other notifications via notify.iphone no matter which WAN I am connected to.

Any ideas as to why this automation is not working?

2

Solved.

Should have been

  action:
    service: notify.ios_iphone