Twilio notification with media attached/included using media_url

Trying to follow the example (below) in the Docs but I’m unable to get it to work, I can get it to perform normal text messages to me so I know my Twilio is working but when I try to include a media_url no text message is received.

# Example automation notification entry
automation:
  - alias: The sun has set
    trigger:
      platform: sun
      event: sunset
    action:
      service: notify.twilio_sms
      data:
        message: 'The sun has set'
        target:
          - '+14151234567'
          - '+15105555555'
        data:
          - media_url: 'https://www.home-assistant.io/images/supported_brands/home-assistant.png'