Invalid usage of syntax or function call detected. Please check the API reference for proper guidelines: https://platform.openai.com/docs/api-reference.

The 400 status error in the Azure OpenAI API, indicated by the message '$.function_call' is invalid. Please check the API reference: https://platform.openai.com/docs/api-reference., can be caused by several factors:

Invalid Request Configuration

The request may have invalid syntax or configuration. This could include incorrect headers, such as the Authorization field, or an incorrect base URL in the request configuration.

Invalid or Missing Properties

The request might be missing required properties or have invalid properties. For example, the input field might be invalid, such as passing an empty string or a malformed input.

Data Payload Issues

The data payload in the request may exceed the maximum size allowed by the OpenAI API, or it may not conform to the expected format. This includes ensuring the payload is correctly formatted and does not contain any invalid or unexpected data.

Rate Limiting and Throttling

The API request may be hitting the rate limits imposed by OpenAI, resulting in the server rejecting the request due to excessive frequency.

Content Filter and Policy Violations

The prompt or input might be triggering content filters or violating Azure OpenAI's content management policies, leading to the request being filtered out.

API Endpoint and Version Issues

There could be issues related to the specific API endpoint or version being used, such as changes in the API that are not accounted for in the current implementation.