Play "Tv" on tv :) ehh

Configuration
1

I made a script to show me some content on my tv by using my chromecast.
But it is not working. What am I doing wrong ?

alias: VRT_Max
sequence:
  - service: media_player.turn_on
    metadata: {}
    data: {}
    target:
      entity_id: media_player.chromecast7852
  - service: media_player.play_media
    data:
      media_content_id: https://www.vrt.be/vrtmax/livestream/video/vrt1/
      media_content_type: video
mode: single
2

The chromecast does not have a web-browser, so starting an URL will probably not work. You need to find a way to start the app, and in the app, the livestream.