Are you certain that the other 400 didn't already exist in your database? This seems like the most likely explanation since HubSpot will not create new contacts if the email address already exists in the system for another contact.
When you do your import, be sure to choose "Create and Update Contacts," so your existing contacts get the benefit of the refreshed data, and also you can create a smart list for these contacts using the "Import Membership" filter to validate all of the contacts in your database that were members of the import.
- Trevor If my post solves your problem, please accept it as a solution.
Are you certain that the other 400 didn't already exist in your database? This seems like the most likely explanation since HubSpot will not create new contacts if the email address already exists in the system for another contact.
When you do your import, be sure to choose "Create and Update Contacts," so your existing contacts get the benefit of the refreshed data, and also you can create a smart list for these contacts using the "Import Membership" filter to validate all of the contacts in your database that were members of the import.
- Trevor If my post solves your problem, please accept it as a solution.