Aggreg -Using File Upload Util- from Delimited File Source Is Missing Records for Identity Creation

Hi @adebomol2024,

Welcome to developer community,
Could you please confirm if your UserA is the first identity and UserB is the second identity in your csv file?
If yes, check your source configuration and see if you have any values set on “number of lines to skip”.
For more details, check these 2 links:

Hope this helps!