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The 400 status error in the Azure OpenAI API, specifically the "Invalid schema for function" error, is likely due to several possible reasons:

Incorrect or Missing Schema

The error message suggests that the schema for the query_variations property is not correctly defined or is missing the required items field in the array schema. This indicates a mismatch between the expected and provided data structure[3,.

Invalid Request Parameters

The API might be receiving unrecognized or invalid request parameters. For example, using parameters that are not supported by the specific model or API version you are using, such as the issue with max_completion_tokens versus max_tokens for different models.

Payload Validation

The API may be strictly validating the payload, and any deviation from the expected format, including missing or incorrectly formatted fields, can result in a 400 error.

Header or Content-Type Issues

Although not directly related to the schema error, incorrect headers or a mismatch in the Content-Type header (e.g., expecting application/json but receiving something else) can also lead to a 400 error.