Cannot generate image using imagen 3

[pielip]

I was given access to imagen 3.  However I got the following exception response:

com.google.firebase.vertexai.type.ServerException: Unexpected Response:
{
"error": {
"code": 429,
"message": "Quota exceeded for aiplatform.googleapis.com/generate_content_requests_per_minute_per_project_per_base_model with base model: imagen-3.0-fast-generate. Please submit a quota increase request. https://cloud.google.com/vertex-ai/docs/generative-ai/quotas-genai.",
"status": "RESOURCE_EXHAUSTED"
}
}

I have checked the quota should already be 20.  And my app can successfully generate response from other model s.a. gemini-1.5-flash-preview-0514.  I use the same logic to query and no avail.

Thanks