You need to set feature flagENABLE_ORA_USERNAMES_ON_DATA_EXPORT to True. That should allow you to get usernames names instead of annonymoust user ids in reports.
Dear Friend @Zia_Fazal , thank you very much, it worked for me, but in the submission.csv file I yet could not find usernames but student anonim id. How can I enable username showing in submission.csv file?. Thanks in Advance!