The Rainmaker platform prevents the addition of duplicate email addresses and phone numbers across the board. As long as the email/number is already uploaded, you will be prevented from adding it manually or uploading it in a CSV file.
Note: Your other valid Reviewer records will not be affected and will still be added
Duplicate records within the same CSV file will also be prevented. The first record will be added to the list, but the second, duplicate record will be deleted.