Announcements / TTS does not work anymore

[xteaun]

I had my Sonos speakers set up to play messages to me when I ask the voice assistant questions. After one of the last HA updates the TTS stopped working. When I call the service, as described in the documentation, I get a green tick, but no audio plays:

service: media_player.play_media
data:
  entity_id: media_player.kitchen
  media_content_id: media-source://tts/cloud?message=I am very loud
  media_content_type: music
  extra:
    volume: 80

What am I doing wrong? :) Is this a bug?