Hi,
I'm trying to update the existing contacts in the Dynamics 365 CRM and want to assign them to an existing Lead Source with the Import Data. I receive partial import and I don't know what is the reason. Some contacts were updated with the needed Lead source, others not.
I have uploaded a screenshot of my import. I don't want to create duplicates and don't want to export and upload contacts again. I want to update their information. Please help me out.