Trigger Smart Campaign not sending out emails

Could you show us your Smart Campaign (Smart List and Flow) and a person that you think should have run through that Campaign but hasn’t?

Hi ​@DebPhillips 

We recently had a similar issue on our side where if we cloned a program, activated the smart campaign (with trigger) then imported a list to activate the trigger is sometimes wouldn’t fire.   Working with Adobe support we discovered that there is a short lag when you activate the trigger for the system to see it. If you import a list right away there is a small chance the server will would miss the list import action and not fire the trigger. This gets especially noticeable if you have a large number of active triggers (we have somewhere like 9k right now...and yes i know this is not great🤣 )  

The temporary solution that seems to be working for us was after activating the smart campaign we needed to wait 1 minute before importing the list. That gives the server enough time to recognize the trigger 

The long term solution that is re-working the smart campaign to run as a batch instead of a using trigger.