Variables - Script + Automation = error

Configuration
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Hey folks, thanks in advance for your advice and help - much appreciated!

I sometimes send notifications to my LG TVs.
The problem is, I get an error (understandably) when the TV is off.

2022-03-03 09:11:00 ERROR (MainThread) [homeassistant.components.webostv.notify] TV unreachable

I thought I would be clever and use a script that checks the TV is on, before sending the notification. In my mind that would hopefully mean no more errors. :crossed_fingers:t2:

My script looks like this ā€¦

 notification_to_lounge_tv:
   alias: "Send a Notification to the Lounge TV"
   mode: restart
   sequence:

    - choose:
        - conditions:
            - condition: state
              entity_id: media_player.lounge_tv
              state: "on"
          sequence:
            - service: notify.lounge_tv
              data:
                message: "{{ message }}"
                title: "{{ title }}"

ā€¦ and the action from the automation triggering it (it triggers fine) looks like ā€¦

  action:
  - service: script.notification_to_lounge_tv
    data: 
      variables:
        title: "TITLE"
        message: "Vehicle Detected"

Now it seems to work in that I still get the notifications, but I also get the below error in addition to my TV unreachable that I had before.

2022-03-03 08:15:34 WARNING (MainThread) [homeassistant.helpers.template] Template variable warning: 'message' is undefined when rendering '{{ message }}'
2022-03-03 08:15:34 WARNING (MainThread) [homeassistant.helpers.template] Template variable warning: 'title' is undefined when rendering '{{ title }}'
2022-03-03 08:15:34 ERROR (MainThread) [homeassistant.components.webostv.notify] TV unreachable

I went through the documentation and even found a few similar(ish) code samples from the forums, but the solution is just eluding me.

Has anyone managed similar to get this working, and can you see what Iā€™m missing please?

Thank you as always!