Smart lists - > Duplicate contacts


I have made a check for duplicate contacts and want to have a list of all duplicat contacts to take aktion on those contacts - i.e delete them

if i choose the report “Status Email Search " and choose on “Misc Criteria” the Tag " smart list - > duplicate contacts” there is no result - even by having a check running infront of that report identifiying that we have thousands of duplicates within our contact list . … any Idea how that “smart list → duplicate contacts” works in the report?

thansk in advance