I am trying to call the following URL in Azure OpenAI, which connects Azure OpenAI with Azure AI Search Service:

api_base/openai/deployments/gpt-4o-eu2/extensions/chat/completions?api-version=2024-02-15-preview

However, I am getting the following error:

{"error":{"code":"404","message": "Resource not found"}}

When I use this URL, which is used to connect with just the Azure OpenAI API, it works properly:

api_base/openai/deployments/gpt-4o-eu2/extensions/completions?api-version=2024-02-15-preview

I am testing these URLs in Postman and passing all the required parameters and api_key correctly.

What could be the reason for the 404 error with the first URL?