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You haven't shown your trigger SC. Triggering on Person is Pushed to Marketo, with optional constraints for program/reason, will capture this activity. (That's what that trigger is for.)
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Please read my response more carefully.
You're currently triggering on an activity (Fills Out Form) that will never occur.
You must trigger on the actual activity you will see in someone's Activity Log (this is always true in Marketo -- there is no activity that you can trigger on which is not present in the log). That activity is Person is Pushed.