Request allowlist access for Gemini 2.5 Flash TTS audio output on Vertex AI

Hello Google AI team,

I’m developing an application on Vertex AI and testing the Gemini 2.5 Pro/Flash TTS model.

When using the google vertex-ai api with package @google-cloud/vertexai

I receive this error:
{“error”:{“code”:400,“message”:“You are not allowlisted to request audio output.”,“status”:“INVALID_ARGUMENT”}} {“stack”:"Error: TTS conversion failed: [VertexAI.ClientError]: got status: 400 Bad Request.

Project number: 439280511836
Region: us-central1

Could you please add my project to the allowlist for audio output in Gemini 2.5 Flash TTS , Gemini 2.5 Pro TTS ?

Thank you very much!