Hey Peter, I don't think you need a constraint on the trigger. It may not have fired again if the People were already members of the engagement program - they would not have been re-added. If I were you, I would probably just schedule the campaign to go out daily at a certain time, or manually run it. I would probably create a list, and set the smart campaign up this way: Smart list: Member of List = Facebook Lead Ads Flow: Send Email Schedule: Schedule Recurrence: Daily And then leave the smart campaign settings that someone can only flow through once. If you would like to have it run more often than daily, you could probably just upload to a list and then manually run each time you were in Marketo uploading the People anyway (or use the trigger "Added to List")
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