Meeting Webhook Endpoint is not responsive error notification

We have been constantly receiving the following email notification:
“Your webhook endpoint is not responsive, please review this email for details.”

However, when I go to marketplace to re-validate, it is already validated and seems to be working fine. Any reason why it keeps triggering this notification?

@iWORK please make sure you return HTTP Response 200 once you receive the webhooks from Zoom, if not there might be a possibility these are considered failed attempts.