12.2.0.1 : ORA-01920 - "user name '%s' conflicts with another user or role name"

Hi ,

I am unable to create a user who mysteriously disappeared from the database ...

This user U9999 exists neither in DBA_USERS NOR in DBA_ROLES !!!

CREATE USER U99999 IDENTIFIED BY Password 

   DEFAULT TABLESPACE TS_DATA

   TEMPORARY TABLESPACE TEMP_USER

   PROFILE SECURE_PROFILE ;

ORA-01920 - "user name '%s' conflicts with another user or role name"

*Cause:  There is already a user or role with that name.

*Action:  Specify a different user name.

Thanks for Help

GD.