If you signed up before Aug 9, 2021, please click Previous plans to view your applicable plans.
This is a notification email that is auto-generated when a Webhook which is triggered from your account fails. This Webhook might be a part of the automations or from your server.
When you set-up webhooks, you would have entered an incorrect URL or the content in the script for webhooks might be incorrect. Please confirm that you have entered the right URL for those webhooks and verify if the rules are set correctly.