Alexa Actionable Notifications template error

Have been following the Mark Watt Tech YT install of actionable notifications for the second time (had it all working then switched to Nabu Casa and trying to just change the external login didn’t work)
Seem to have completed most of it, but when I try to call service:
service:script.activate_alexa_actionable_notification data
I get an error message:
`Failed to call service script.activate_alexa_actionable_notification. Error rendering data template: Result is not a Dictionary’
Can anyone point me at what I need to look at to fix this ?
The script is as follows, with the media_content changed to protect the guilty.
I do realize that the YT video is now a couple of years old, so may be out of date.
If I ask Alexa to “open hello world”, that seems to work, so I think the Alexa skill is linked ok.

alias: activate_alexa_actionable_notification
description: Activates an actionable notification on a specific echo device
fields:
  text:
    description: The text you would like alexa to speak.
    example: What would you like the thermostat set to?
  event_id:
    description: Correlation ID for event responses
    example: ask_for_temperature
  alexa_device:
    description: Alexa device you want to trigger
    example: media_player.master_bedroom_echo_dot
  suppress_confirmation:
    description: Set true if you want to suppress 'okay' confirmation
    example: "true"
sequence:
  - service: input_text.set_value
    data_template:
      entity_id: input_text.alexa_actionable_notification
      value: >-
        {"text": "{{ text }}", "event": "{{ event_id }}",
        "suppress_confirmation": "{{ suppress_confirmation }}"}
  - service: media_player.play_media
    data_template:
      entity_id: "{{ alexa_device }}"
      media_content_type: skill
      media_content_id: amzn1.ask.skill.abc
mode: single
  - service: input_text.set_value
    data:
      value: >-
        {{ {"text": text , "event": event_id, "suppress_confirmation": suppress_confirmation } | to_json }}
    target:
      entity_id: input_text.alexa_actionable_notification

Thank you Drew
For the hard of thinking (obviously me), this replaces:

 - service: input_text.set_value
    data_template:
      entity_id: input_text.alexa_actionable_notification
      value: >-
        {"text": "{{ text }}", "event": "{{ event_id }}",
        "suppress_confirmation": "{{ suppress_confirmation }}"}

Or am I, as usual, getting it wrong ?

Yes, it’s a drop-in replacement for the original service call. The original one included the out-dated data_template variable and has some incorrect use of quotation marks… so none of the field variables being passed to the script would have valid values.

Hi Drew (or anyone else)
Still appears to be a problem with the script. I of course could have messed up the replacement above, but now getting the following error in the Dev Tools if I call the service:
Failed to call service script.activate_alexa_actionable_notification. Error rendering data template: TypeError: Type is not JSON serializable: LoggingUndefined

The full script, as I have it now is:

alias: activate_alexa_actionable_notification
description: Activates an actionable notification on a specific echo device
fields:
  text:
    description: The text you would like alexa to speak.
    example: What would you like the thermostat set to?
  event_id:
    description: Correlation ID for event responses
    example: ask_for_temperature
  alexa_device:
    description: Alexa device you want to trigger
    example: media_player.master_bedroom_echo_dot
  suppress_confirmation:
    description: Set true if you want to suppress 'okay' confirmation
    example: "true"
sequence:
  - service: input_text.set_value
    data:
      value: >-
        {{ {"text": text , "event": event_id, "suppress_confirmation":
        suppress_confirmation } | to_json }}
    target:
      entity_id: input_text.alexa_actionable_notification
  - service: media_player.play_media
    data_template:
      entity_id: "{{ alexa_device }}"
      media_content_type: skill
      media_content_id: amzn1.ask.skill.4a0c2e10-b8d6-460b-8918-66c6a04cc727
mode: single

Hi, I think this is the correct value to pass to the input_text

service: input_text.set_value
data:
  entity_id: input_text.alexa_actionable_notification
  value: >-
    {"text": "{{ text }}", "event": "{{ event_id }}", "suppress_confirmation":
    "{{ suppress_confirmation }}"}

I find it a little confusing that it would take a json formatted string, but the followinf seems to be accepted…

alias: activate_alexa_actionable_notification
description: Activates an actionable notification on a specific echo device
fields::
  text:
    name: Text
    description: The text you would like alexa to speak.
    example: What would you like the thermostat set to?
    required: true
    selector:
      text:
  event_id:
    name: Event ID
    description: Correlation ID for event responses
    example: ask_for_temperature
    required: true
    selector:
      text:
  alexa_device:
    name: Alexa Device
    description: Alexa device you want to trigger
    example: media_player.master_bedroom_echo_dot
    selector:
      entity:
        filter:
          - domain: media_player
            integration: alexa_media
  suppress_confirmation:
    name: Suppress Confirmation
    description: Set true if you want to suppress 'okay' confirmation
    default: true
    selector:
      boolean:
sequence:
  - service: input_text.set_value
    data:
      value: >
        {{ {"text": text|string , "event": event|string, "suppress_confirmation": suppress_confirmation | string | lower } }}
    target:
      entity_id: input_text.alexa_actionable_notification
  - service: media_player.play_media
    data:
      entity_id: "{{ alexa_device }}"
      media_content_type: skill
      media_content_id: amzn1.ask.skill.example
mode: single

Drew
I am continually in awe of this community, with how it tries to help people like me who really are in over their heads. Thank you so much for taking the time to try to fix this for me.
It appears as though you have cracked it - at least I am not getting any errors showing in the config or any notifications when I restart HA.
Unfortunately there is still an issue - any testing just gets an error response - in the Alexa app, the latest one says the Lambda application returned a failed response.
So I think I have to try to rebuild the skill again - maybe this time I will try to follow the instructions from the developer, rather than maybe what I did last time, which could have been a bit of a mix and match with this and a YT video that is now 2 years old.
Maybe one day I will learn.