When trying to run a campaign using a list with the Data Import Wizard but the campaign doesn't launch.
Campaign, Data Import Wizard
In a case where a campaign is set to be triggered by a Contact update, you must upload Contacts through the Data Import Wizard and select "Update Existing data."
If you use another setting such as "Keep Original Data," the campaign will not trigger.
For more information regarding campaigns refer to Answer 2263: Using Outreach Campaigns.