I am building a workflow that fires when an Outlook calendar event is added, updated, or deleted. So, I am using the "when an event is added, updated or deleted" trigger. When a calendar event is added, updated, or deleted, a SharePoint item is created or modified. Similarly, there is another workflow that fires when a SharePoint item is created, or modified. When an item is created or modified in SharePoint, an event is created or modified. Because the same SharePoint list is used, the workflows trigger each other. I have been able to add a trigger condition to the "When an item is created or modified" action but when I tried using the "IsAdded" and "IsUpdated" flags as trigger condition to the "When an event is added, updated, or deleted" action, the flow does not fire under any condition.