Hey there Dominick thanks for reaching out, the reason why you were not able to add these leads to the campaign is due to the fact that they already exist in a different one. As you can see in the "Lookup Lead in Campaign" column in the screenshot below these leads exist in your Smartlead database but are in a different campaign. What you can do here is in the "Add Lead to Campaign" integration menu you can choose to toggle on the "Allow Duplicate Leads Across Campaigns" in order to be able to add them to a second campaign as well.
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