Ok I am using a suse linux distribution
Linux linux-s1tw 18.104.22.168-1.2-default #1 SMP 2011-02-21 10:34:10 +0100 i686 athlon i386 GNU/Linux
I am trying to allow a group of users to change passwords on the system only and they both work but sometimes the sudo doesn't work and I have to reset the users password and then it works see below
mtolbert@linux-s1tw:~> sudo -l
Sorry, try again.
Then when I change the password it works but then it after a little while I have to change the password again.
Line from /etc/sudoers file
%techteam ALL=(ALL) PASSWD: /usr/bin/passwd
Output from groups command
mtolbert : techteam