Why can't I process potential duplicate records as part of importing records?

If you select duplicate detection when you start a data import, when potential duplicate records are detected as part of importing records, the potential duplicate records are not imported. You are not offered a choice for each record of whether to merge the records or delete or deactivate one of the records.

If you want to have a choice for each potential duplicate record, turn off duplicate checking during import, and after the import job finishes, run duplicate detection to processs potential duplicate records.