Webhook Events Not Received (meeting.participant_joined & meeting.participant_left)

Hello Zoom Developer Team,

We are integrating Zoom Event Subscriptions into our application and are encountering two issues.

App Details

App Name: Events.Studio.3
App Type: User-managed General App
Zoom Account: gms@globibo.com

Custom Domain:

Issue 1: Webhook Payload Not Received

We subscribed to the following events:

  • meeting.participant_joined
  • meeting.participant_left

Event Subscription is enabled and validated successfully.

In the Zoom Event Dashboard, we can see:

meeting.participant_joined → Successful
meeting.participant_left → Successful

However, our endpoint does not receive these events.

We tested:

  • Svix webhook inspector
  • Direct webhook endpoint
  • ngrok webhook inspector
  • Webhook validation event works correctly

Only endpoint.url_validation is received.

Question:
Why does Zoom Event Logs show “Successful”, but the webhook payload is not delivered to our endpoint?

Issue 2:
Custom domain in webhook:

When we add the endpoint in the event subscription with our custom domain, it does not allow us to validate. While if we do it with our “Azurewebsites“ domain, it validates successfully.
Any guidance would be appreciated.

Thank you.