Sudo not working with AD account
Sudo Version is not compiled with PAM support.
As long as SUDO has been compiled with PAM support the user will authenticate with AD before the user is granted access to the SUDO function they are calling. If SUDO is not compiled with PAM support then AD users will not be able to use the SUDO function because SUDO will not know how to locate the user.
To check if Sudo is compiled with PAM run # ldd `which Sudo`
If it is not compiled with PAM you will need to install another version of Sudo.
If on AIX the Sudo binary can work without PAM, as it should use LAM and access VAS that way.