Building Retool App with OpenAIs Assistant API

Hi all! Trying to build a Web App with the Retool UI.

First, built the OpenAI Assistant in the Dashboard.
Second, created a new Rest API Resource in Retool,
Third, created a new Query in Retool using the Rest API.

When testing the query, it gives me an invalid_request_error message in Retool. Anyone has any experience with this particular workflow and can help me out here? Much appreciated. (Of course, I had my OpenAI API key created as well before)

Thank you