Northtrn Trail Outfitters mistakenly synced the User_Salesforce object which added to their billable contact count.
What should be recommended to remove these contacts'
To remove contacts mistakenly synced from the User_Salesforce object, the recommended approach is to put the synced records into a sendable data extension and use Contact Delete (C). This method allows for the systematic deletion of these contacts from the All Contacts table without affecting other data.
Salesforce Marketing Cloud Contact Delete
Managing Contacts in Marketing Cloud
Ettie
25 days ago