Gemini API returns 403 Forbidden – Your project has been denied access for multiple supported models and newly created API keys.

Gemini API
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1

I am integrating the Gemini API into my Node.js project using the official @google/generative-ai SDK. The API consistently returns a 403 Forbidden error stating, “Your project has been denied access,” when calling generateContent. I tested multiple models, including gemini-2.5-flash and gemini-3.8-flash, and also created a new API key/project, but the same 403 error persists. The API key is passed using the standard Gemini API authentication method, and the request reaches the Gemini API successfully but is denied at the project-access level. Please check whether my Google Cloud/AI Studio project or account has an access restriction and help enable Gemini API access.

2

Hello @SUSMITHA_M ,

Getting a 403 API error response and / or seeing “Unavailable” next to your project in AI audio indicates a flag has been placed on your account. To proceed:

  1. If you’re on the free tier with no billing attached, please try the below steps:

  2. Check Model Availability & Rate Limits:

    • Ensure that the model you are requesting is available on your current plan. For example, not all models are available on the free tier. You can verify model availability, quotas, and limits on the AI Studio Rate Limit dashboard.

  3. Ensure you have completed age verification by navigating to Google Account Age Verification and verifying date of birth in Google Account Personal Info.

  4. Complete Phone Verification and turn on 2-Step Verification (2SV) on the Google Account associated with your project.

  5. Once age, phone and 2sv are configured, retry your request or create a new API key in Google AI Studio.

  6. If completing these steps still does not restore access (or if using a model requiring a paid tier), you might want to consider adding prepayment credits directly in Google AI Studio and/ or attaching a Google Cloud Billing account in the Google Cloud Console. Please note this will mean you lose your free tier quota.

  7. If you are on a paid tier:

    1. Check for banners / error callouts in the AI Studio Projects page & the Billing page. Mostly these flags cause visible banners or other errors on these pages with concrete next steps / appeal links. You can also check the email address associated with your project for information on next steps.

    2. If your GCP project/ billing account is suspended, you must submit an appeal directly through the Google Cloud Console following the Project Suspension Guidelines (Help Center)