Webhook notification channel issues

I configure webhook notification channel, set url to Cloud event management webhook …Tried to test the channel but got this error. Unable to invoke Webhook. Webhook responded with HTTP status code 400…I have done trouble shooting following the link…

The below error comes when tried to post the request using postman.

“code”: 400,
“message”: “undefined fails validation against “newrelic.attributes.details”.”,
“level”: “error”

Can you provide an insight on this.

Can you share a link to the Notification channel in question? I’ll try to see if we have any more useful error information on this.