If you're trying to invite a user to a security group and the group won't show up in the invitation list, you might be missing the Add Members permission for that security group.

1. In the main navigation tree the Site, Project, or container where the security group was created, select Administration.
2. Select Security Groups.
3. Right-click on the mouse icon and select Permissions.
4. From Group or Profile Permissions, select the security group.
5. From Permissions, select Allow next to Add Members.
6. Click Apply.

If you attempt the invitation again, the security group is available to select.