The 'messages' parameter is expected to be of type 'array'. Please ensure the input follows the required data structure.

The 400 status error you are encountering with the Azure OpenAI API could be due to several reasons:

Incorrect Request Format

The error message indicates that the request is not of the expected type, specifically mentioning that 'messages' is not of type 'array'. This suggests a mismatch between the expected format and the format of the data you are sending in your request.

Authentication or Authorization Issues

There could be issues with the authentication or authorization process. For example, an incorrect subscription key, an expired key, or improper configuration of managed identities can lead to such errors.

Content Filtering Policies

Azure OpenAI has content filtering policies that can filter out certain prompts. If your prompt triggers these policies, it could result in a 400 error.

Malformed Resource ID or Endpoint

The error could also be due to a malformed resource ID or an incorrect endpoint URL being used in the request.

API Version or Compatibility

Using an incorrect API version or incompatible parameters can also lead to a 400 error, as the API may not support the specified parameters or version.