Using the formula =IF(UPN@row <> "", INDEX({Cardinal Metadata - UPN & UPI List
'EI&C'}, UPN@row, MATCH(UPN@row, {Cardinal Metadata - UPN & UPI List 'UPN'}, 0)), "")
to return the email address if the UPN is not blank in the destination sheet, eliminates errors if the look up sheet has an entry in a blank row, I get invalid value. I have checked all my column types and they are correct. A shortened version of the formula without the IF statement added works except when we proofed the formula and put an email address in row without a UPN number all cells in the column were filled in.