User data validation error file may not be output

Content (please ensure you mask any confidential information):

1.Start import management

2.Import has been executed (number of records is 1)

3.The result is Completed With Errors and Errors Reported is also 1.

4.Normally, a User data validation error file is output that describes the cause of the error, but it may not be output.

What are the causes of the above? Also, is there a way to resolve it?

Version (include the version you are using, if applicable):

24A (11.13.24.01.0)