I am using winbind and samba to authenticate Ubuntu 12.04+ machines against Active Directory. I followed this guide: https://help.ubuntu.com/community/ADAuthentication
Everything worked just as expected. I am able to register the machines on AD, I can ssh into them using my Windows credentials, I can add user to the sudoers file and permissions work fine. The issue I am having is when I add a AD group to sudoers, nobody in that group has privileges. Also, if I getent a user, again everything comes out fine form AD. If I getent group , it returns nothing. Not sure where I am disconnected. Thanks for the help
/etc/sudoers
file