3rd party service shows "Webhook URL connection error" on only 1 request. No error log in Retool workflow

💬 Workflows
1
  1. My goal: every single call to Retool workflow should be successful.
  2. Issue: I have a web page hosted on Tess. On this web page, I have a form submission to which Tess delivers to my Retool webhook. In most cases, it delivered correctly, but this Friday I got a notification from Tess that delivery failed. At the same time, in Retool I don't see this delivery attempt at all.
  3. Steps I've taken to troubleshoot:
  4. Additional info: (Cloud or Self-hosted, Screenshots)

Error in Tilda.

Screenshot 2026-03-16 at 10.07.13 AM
Screenshot 2026-03-16 at 10.07.13 AM1920×882 101 KB

Log in Retool:

Screenshot 2026-03-16 at 10.12.08 AM
Screenshot 2026-03-16 at 10.12.08 AM1920×1103 98.1 KB

Workflow URL: https://healthspan2024.retool.com/workflows/3412883a-9133-435f-b8bc-a828123223cc?runId=019ce6f5-5ca6-720e-9730-912fc8faa962

Thank you,

  • Mia
3

Hey @Healthspan_Technical - thanks for reaching out. The specific error that you're seeing - Access denied: [403] - means the API key you provided was either incorrect or missing. Have you continued to see the same error on form submission?

4

My bad! Seems like it was 3rd party problem - they removed header from request. Thank you for pointing what to look for🧡

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