Webhook - The request could not be understood by the server due to malformed syntax

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Good day All,

Can you please assist, I have created a web-hook for listening for topic "orders/create". It seems like the webhook is attempting to call my API but it's returning an error message that says "The request could not be understood by the server due to malformed syntax."

The web-hook is suppose to call my API every time someone places an order. My API endpoint is working fine when call in directly in Postman with the required data - the data for creating an order as per think ling https://shopify.dev/api/admin/rest/reference/events/webhook. My API is deployed in Azure. I have attached the error log that I get from Azure logs.

I will really appreciate any help. I have been sitting with this problem for 2 days now.