Request allowlist access for audio output in Gemini 2.5 Pro/Flash TTS (Vertex AI)

Gemini API
,
1

Hello Google AI team,

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

When calling the endpoint:

https://us-central1-aiplatform.googleapis.com/v1/projects/617644234155/locations/us-central1/publishers/google/models/gemini-2.5-pro-preview-tts:generateContent

I receive this error:
“You are not allowlisted to request audio output.”

Project number: 617644234155
Region: us-central1

Could you please add my project to the allowlist for audio output (speech synthesis) in Gemini 2.5 TTS preview?

Thank you very much!

2

Hi @Nick31,

Welcome to the Google AI Forum! :confetti_ball: :confetti_ball:

Have you enabled TTS model in your cloud console?. Please refer to this document on how to use it doc

Happy coding :slight_smile:

4

Hi!
I’m facing the same issue.

The TTS model is enabled in my console, but when I send a request to the API endpoint, I get the following error:

{
	"error": {
		"code": 400,
		"message": "You are not allowlisted to request audio output.",
		"status": "INVALID_ARGUMENT"
	}
}

How can I fix this? Do I need to request access to the audio output feature or enable something in my project settings?

Thanks in advance!