Can't set MPD volume

I’m using MPD for local TTS and sounds through USB speakers attached to the Windows 10 computer where I have HA running on VirtualBox, and it works well, except I can’t seem to set the volume for it.

I call media_player.volume_set in my script, but it just gets ignored, and MPD always defaults to 85% when playing sound, and 0% when it is not.

Here is the script that I use. The sound and the message are are played properly, but even though the trace shows that the sound level should have been set it always is around 85%.

alias: announce
sequence:
  - service: media_player.volume_set
    target:
      entity_id: media_player.mpd
    data:
      volume_level: '{{ states(''input_number.volume'') | float }}'
  - service: media_player.play_media
    target:
      entity_id: media_player.mpd
    data:
      media_content_id: http://192.168.1.99:8123/local/sounds/{{type}}.mp3
      media_content_type: audio/mp3
  - delay:
      hours: 0
      minutes: 0
      seconds: 0
      milliseconds: 750
  - service: tts.cloud_say
    data:
      entity_id: media_player.mpd
      language: en-US
      message: '{{ message }}'
      options:
        gender: female
mode: single
icon: mdi:bullhorn

And now the trace that shows it SHOULD be setting the volume:

Result:
params:
  domain: media_player
  service: volume_set
  service_data:
    volume_level: 0.1
    entity_id:
      - media_player.mpd
  target:
    entity_id:
      - media_player.mpd
running_script: false
limit: 10

Can anyone see what I am doing wrong?

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