Troubleshooting duplicate or missing identifier error messages

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Learn about duplicate 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

An invalid date format error message in the list upload process

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 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 file. 

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