GPT not communicating with custom Make Webhook

GPT builders Plugins / Actions builders
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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?

1 Like
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Yes I can help you with you call.
Can you share your schema ?

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GenerateStructuredMarkdownPromptIntegratedCommandActionButtonContinueStructuredOutputGeneratedUniversalActionAutomatedNextActionButtonContinueWithSystemMessagesStartNowNext

4

I am encountering this error as well. I have a custom GPT action connected to an API gateway and lambda function. Curl requests and lambda internal testing both work. However, the GPT keeps giving internal errors. I can send my schema and function code in DMs if needed.

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Hi. I am encountering same error, defining webhook url in schema and get a connection error explaining end point is at fault when manually testing it works. What is happening (with me) ChatGPT is swithing the webhook url despite hours of trying to enforce its strict usage. the name “jit_plugin” comes up often and seems to be the cause (ask chat GOT to repeat the exact webhook it connected when it got the error). Instructions like

"1. Always send POST requests ONLY to the exact URLs defined by the OpenAPI schema:

  • Base URL + exact path from the “paths” section.
  • Never guess, construct, or infer webhook URLs.
  • Never use operationId values for routing or URL generation.
  • Never rely on or invoke any fallback plugin or internal logic (e.g., jit_plugin)."

are not enough