We’ve improved the CSV upload for participant information by introducing new checks to ensure IMEI validity before upload. If an error is detected, the upload is blocked, and a message is displayed. This addresses issues users encountered when editing participant files in programs like Excel, which sometimes resulted in broken IMEIs.

These checks help prevent invalid app IDs moving forward 

• Characters a-z, A-Z, 0-9, _ , and - are permitted. 
• IDs with 15 digits are treated as IMEIs.
• Verify the checksum to ensure accuracy. 

For more details on how to provide participant data, visit our documentation: https://docs.racemap.com/api-import-and-export-data