After logging to PIM/PAMSC endpoint:
$sewhoami
acuser
$sewhoami -a
acuser
ACEE Contents
User's Name : _undefined
ACEE's Handle : 0
Release : all
Component : Privileged Identity Manager PAM SERVER CONTROL ENDPOINT UNIX/LINUX
Please check osuser_enabled token in $SEOSDIR/seos.ini file.
If the token is no, the login user will be recognized as _undefined.
So please set yes into the token and start PIM/PAMSC services.