voice/tts - 400 Bad Request

[mupm1]

400 Bad Request https://api.amerandish.com/v1/voice/tts

{
"synthesisInput": {
"text": "سلام"
},
"voiceConfig": {
"languageCode": "fa",
"voiceId": "b6e9c993-729e-4e0f-955b-f229cf1f77ee",
"name": "speaker-01",
"gender": "female"
},
"audioConfig": {
"audioEncoding": "MP3",
"speakingRate": 1.2,
"pitch": 0.0,
"volumeGainDb": -2,
"sampleRateHertz": 16000
}
}

response -->

{
"status": 400,
"detail": "synthesis output data is not valid.",
"title": "Bad Request",
"type": "HTTPBadRequestError"
}