Hello, I have been trying to use the Gemini API but am consistently receiving a `404 Not Found` error, even after trying every possible troubleshooting step with a helper. I believe this might be an account-level or internal Google issue. **The Error:** `google.api_core.exceptions.NotFound: 404 models/gemini-pro is not found…` **What I have tried:** 1. **Started with an initial project (PII Removed by Staff).** * Enabled all necessary APIs (`Generative Language`, `Vertex AI`, `Cloud Build`, etc.). * Linked a valid billing account. * Tested with both the `generativelanguage.googleapis.com` endpoint (using a new API key) and the `aiplatform.googleapis.com` endpoint (using an OAuth2 access token). Both returned a `404 Not Found` error, even when targeting the `us-central1` region. * Granted all necessary IAM roles (`Vertex AI User`, `Service Account User`, etc.) to my user account. 2. **Created a brand new Google Account (PII Removed by Staff) and a brand new Google Cloud Project (PII Removed by Staff) to rule out any existing project/account issues.** * Linked a valid billing account. * Enabled the `Vertex AI API`. * Logged in with `gcloud auth login` for the new account and generated a new access token. * Sent a request to the `us-central1` Vertex AI endpoint for the `gemini-pro` model. **Result:** Even with a completely new account and a perfectly configured new project, I am still getting the exact same `404 Not Found` error. This seems to be beyond a simple configuration error. Has anyone else experienced this? Any help would be greatly appreciated. Thank you.