How to sent a critical notification with the alert Domain?

Configuration
1

How do I sent a critical notification with the alert domain to an iOS device with the home assistant App installed?

2

Combining both pages you’re linking to:

  notifiers:
    - my_iphone # not `notify.my_iphone`
  data:
    push:
      sound:
        name: "default"
        critical: 1
        volume: 1.0

Although I use a somewhat different configuration for my alerts, which works fine too (but perhaps it’s an older configuration format, so I’ll change it to the version above):

notifiers:
  - my_iphone
data:
  sound:
    name: 'default'
    critical: 1
    volume: 1.0