The group policy will needed to be edited and the group added to it.
Here are the steps:
1 - Open up Microsoft Group policy Manager and edit your host access policy
2 - Expand Computer configuration | Policies | Unix Settings | Quest Authentication Services | Access Control
3 - On your right double click users.allow and click group
4 - After the policy has been edit on the client do the following:
Login to Putty and do the following commands:
vgptool apply
vgptool rsop
vastool info acl command to ensure group is shown
vastool user checkaccess <username>
Test login