Volume_set not working

Configuration
1

Whats wrong with this action?

action:
        - service: volume_set
          entity_id: media_player.squeezebox_radio
          data:  
            volume_level: 0.5
2

I think you need to put the domain in the service call - service: media_player.volume_set

so try

action:
  - service: media_player.volume_set
    data:  
      entity_id: media_player.squeezebox_radio
      volume_level: 0.5
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