Request allowlist access for audio output in Gemini 2.5 on Vertex AI

Hi Google Team,

I am currently developing an automated media generation system and would like to request Audio Output (TTS) allowlist access for my Google Cloud Project.

I have confirmed that I can successfully generate audio using Gemini 2.5 Flash in Google AI Studio, but I am still receiving the following error when calling the API via Vertex AI: “You are not allowlisted to request audio output.”

Project Details:

  • Project ID: gen-lang-client-0665843069

  • Project Number: 129056190883

  • Region: us-central1 (或者是你目前使用的區域)

  • Model: gemini-2.5-flash

  • Use Case: Generating news articles with synchronized audio content for automated media feeds.

Could you please help me enable the response_modalities=["AUDIO"] capability for this project?

Thank you for your assistance!

Best regards, Nate