Troubleshooting duplicate or missing identifier error messages
You will learn
Learn about duplicate or missing identifier errors and how to resolve them in your list uploads.
If you’re encountering a different error message, head to our guide on troubleshooting list imports.
Duplicate identifiers
Records skipped due to "Duplicate Unique ID" mean that an email address or phone number was repeated in your file. In these cases, Klaviyo will process the data from the first row containing the repeated identifier and will provide all non-processed records in a downloadable file.
Click Download Skipped Records to see the contacts skipped due to duplicate identifiers and re-upload these skipped records if needed.
Missing unique identifiers
Records skipped due to “Missing Unique ID” mean the skipped rows did not contain an email address, phone number, or other accepted unique identifier.
Click Download Skipped Records to see the contacts skipped due to missing identifiers, add an email address or phone number for each one, and re-upload your new file.
Additional resources
- Understanding profiles in Klaviyo
Learn about profiles, including how to find them and the data available on the profile page. Profiles are used to keep track of all the information you have about your customers and prospects.
- Profile properties reference
Learn about the difference between custom and Klaviyo properties, how to use them to track information about your subscribers, how to remove them, best practices, and more.