"Attempting to add a non-unique value to a field marked "unique" error on a QB Connected Table

Hi Mark, yes, I checked on the source table, which has 'user account' as a key field (not sure why we did that when we created the table). There were a few accounts showing multiple records, where someone has two accounts linked to separate email addresses (so not identified as duplicates when checked in Excel). I've removed the 'duplicates' but am still getting the same error.