Meta webhook verification fails with the 'couldn't be validated' error, even though the execution log in n8n shows the workflow runs successfully every time

Questions
1

The problem is that the workflow executes successfully every time but the verification steps fails on the meta developer page

I have already tried:

  • Using both test and production URLs.

  • Setting HTTP Method to “All Methods”.

  • Confirming the “Respond Immediately” setting.

  • I built a 3-node manual workflow to craft the response, and even that failed despite the execution log showing it worked.

What is the error message (if any)?

image

Share the output returned by the last node

image
image1883×913 113 KB

Information on your n8n setup

  • n8n version:
    1.112.3
  • Database (default: SQLite):
  • n8n EXECUTIONS_PROCESS setting (default: own, main):
  • Running n8n via (Docker, npm, n8n cloud, desktop app): n8n cloud
  • Operating system:w11
2

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