Can't log USERID

[janpan722]

here is my telnet file within /etc/xinetd.d/

service telnet
{
log_type = FILE /var/log/telnet.log
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_success += USERID PID DURATION
log_on_failure += USERID
}

My telnet.log file shows PID, DURATION but not USERID. What do i miss??? Please help