GPT not communicating with custom Make Webhook

Hey! Hoping someone here has had this issue and found a fix?

I am attempting to send JSON data to a custom Make webhook. The webhook itself works fine and can recieve JSON data (I tested it manually using POST), however for whatever reason it appears the GPT itself cannot interact with the external webhook. I get an access denied error. More specifically I get this:

“tool_error
The outbound call did not succeed, inform the user succinctly but keep important details intact. The complete interaction data follows: Access denied.”

Has anyone had any luck over coming this?

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