ServiceNow X.509 certificate not sent on Certificate expiryIssue Service sends notification reminders to the users added in the "Notify on expiration" of X.509 certificate expired prior to 2 to 4 week with the subject: "Your ServiceNow X.509 certificate has expired"ReleaseAllCauseBelow are the possibilities "Certificate Expired" and "Certificate Expiring" Notification is not active"certificate events" Business Rule is not activeNo emails added to the "Notify on expiration" section of X.509 certificateResolutionCheck below and enable if these are disabled : "Certificate Expired" and "Certificate Expiring" Notification set to "Active" if not active"certificate events" Business Rule set to "Active" if not activeAdd the email address to "Notify on expiration" section of X.509 certificate Related LinksCheck KB to Replacing an expiring SAML certificate: Replace Certificate