Browser_Mod: How to call "fire-dom-event" from a script?

Configuration
1

An update to Browser_Mod made it so that in order to get a toast or popup on the current screen, you’d do something like this:

        hold_action:
          action: fire-dom-event
          browser_mod:
            command: popup
            title: Set Favorite Sleep Numbers
            card:
              type: entities
              entities:
                - entity: input_number.sleepnumber_joe_favorite
                  name: Joe's Favorite
                - entity: input_number.sleepnumber_dale_favorite
                  name: Dale's Favorite

Problem is that I have most things done via scripts, and calling the browser_mod.toast service only toasts on one device… and not necessarily the one I want. (See setup below)

service: browser_mod.toast
data:
  message: Hello World
  duration: 10000

How can I get a toast notification to show up on either:

  1. ALL dashboards on ALL devices from within a script?
  2. The last interacted with dashboard (i.e. the user taps the scene button on the downstairs tablet, so the script shows it there)

My full script code which doesn’t work is:

set_scene_bedroom:
  alias: Set Scene Bedroom
  fields:
    scene_name:
      description: The scene name without scene. or a room
      example: bedroom_evening
  sequence:
    - choose:
        - conditions:
            - condition: template
              value_template: "{{ scene_name == 'no_scene' }}"
          sequence:
            - service: light.turn_off
              target:
                entity_id: light.all_bedroom_lights
              data:
                transition: '{{ states("sensor.bedroom_light_fade_speed_seconds") }}'
        - conditions:
            - condition: template
              value_template: "{{ scene_name != 'no_scene' }}"
          sequence:
            - service: scene.turn_on
              target:
                entity_id: scene.{{ scene_name }}
              data:
                transition: '{{ states("sensor.bedroom_light_fade_speed_seconds") }}'
    - choose:
        - conditions:
            - condition: template
              value_template:
                "{{ states.sensor.bedroom_light_fade_speed_seconds.state|float
                > 5.0 }}"
          sequence:
            - service: input_select.select_option
              data:
                entity_id: input_select.bedroom_light_fade_speed
                option: Fast
    - service: browser_mod.toast
      data:
        message: Scene {% set sceneEntity = "scene." ~ scene_name %}{% if state_attr(sceneEntity, "friendly_name")|string == "None" %}transition{% else %}{{ state_attr(sceneEntity, "friendly_name") }}{% endif %} complete.
        duration: 20000
        deviceId: this
  mode: single
2

Update: It seems that the toast DOES appear on all devices, it was just that I had multiple windows open with the same device ID on the computer I was debugging from.

Any way to get it to show on all opened windows? Otherwise, I consider this solved.