Message to phone, only when at home

Configuration
1

Hello experts,

I’m frustrated in building an automation that should inform all mobile-phones who are at home, that a window has to be closed.
The only thing I can do is to send the message to one phone.
I don’t find the possibility to set the “at home” condition referring to each mobile.

Do I have to buid an automation for each mobile individually?

This is my code so far…

- id: '1640862793872'
  alias: Erinnerung an Fenster im Gäste WC
  description: ''
  trigger:
  - platform: state
    entity_id: binary_sensor.fensterkontakt_gaste_wc_access_control_window_door_is_open
    for:
      hours: 0
      minutes: 15
      seconds: 0
    from: 'off'
    to: 'on'
  condition: []
  action:
  - service: notify.mobile_app_oneplus_a6003
    data:
      message: Das Fenster im Gäste WC muss geschlossen werden
      title: Warnung!
  mode: single
2

Notifications to Multiple Devices