The notification triggered by an event has less users than Parm1 in the eventIssue The notification triggered by an event does not have the same amount of users between the event parm1 and the notification send to. Parm1 has three users defined but the notification was sent to only two users.ReleaseNew YorkCause"Notification" setting is disabled for One user.ResolutionEnable Notification settings for the missing user on the instance.Log in with the user > Click on the Wheel Icon on the Top Right > Go to Notifications > Allow Notification