N8N102 - Webhook authentication returning 403 / Academy validation failed

n8n Academy N8N102: Integrations: APIs and Connected Workflows
1

Hi everyone,

I’m working through the N8N102: Integrations: APIs & Connected Workflows course and I’m stuck on the “Create a secure webhook endpoint” exercise.

I created the workflow with the following configuration:

  • Workflow name: Section 2 - Order Webhook Processor
  • Tag: n8n102
  • Webhook node name: WebhookNewOrder
  • HTTP Method: POST
  • Path: course/n8n102/new-order
  • Authentication: Header Auth
  • Credential: n8n Academy API Key
  • Response: Using Respond to Webhook Node

The production webhook URL is:

https://lewisblack.app.n8n.cloud/webhook/course/n8n102/new-order

The workflow is published/active.

My Header Auth credential is configured as:

Name: X-API-Key
Value: Academy API key

However, the Academy assessment fails with:

“Validation Failed
webhook_url is not valid. Please ensure your hostname resolves and is publicly accessible.”

If I open the webhook URL in a browser I get:

“This webhook is not registered for GET requests. Did you mean to make a POST request?”

I am on cloud N8N.

Has anyone completed this N8N102 exercise and encountered this issue? Is there another Header Auth configuration required, or could this be an issue with the Academy validator?

2

Hello,

I’ve tested your webhook and it appears to be passing step 1 now. Please recheck and run the tester again.

cheers,

3

Please I am having the same issue with my production url https://olaideola.app.n8n.cloud/webhook/course/n8n102/new-order