Create Talk API call returns 500 Internal Server Error

The call was working before but after plan upgrade it fails with previously valid input. Here is an example I used for testing:

curl --request POST \
     --url https://api.d-id.com/talks \
     --header 'accept: application/json' \
     --header 'authorization: Basic YUdWcGJtVnlRR1JwWjJsMFlXeHVZWFJwYjI1bGJuUXVZMjl0Ok9iNk9MaFZ0U3lka3hCSEFPNTBtdw==' \
     --header 'content-type: application/json' \
     --data '
{
  "script": {
    "type": "audio",
    "provider": {
      "type": "microsoft",
      "voice_id": "Jenny"
    },
    "ssml": "false",
    "reduce_noise": "false",
    "audio_url": "https://www.pacdv.com/sounds/voices/maybe-next-time.wav"
  },
  "config": {
    "fluent": "false",
    "pad_audio": "0.0"
  },
  "source_url": "https://create-images-results.d-id.com/api_docs/assets/noelle.jpeg"
}
'

{
  "kind": "UnknownError",
  "description": "Internal Server Error"
}