A user can be a member of up to 64 groups. To assign a
user to a group, both the user and the group must have the same registry
type.
If a user that you want to add to the group is not listed, one
of the following issues might be the reason:
- The unlisted user does not have the same registry type as the
selected group.
- The unlisted user belongs to the maximum number of 64 groups.
- The unlisted user does not exist in the cluster.
To create a user, see the Creating a User topic in the AIX® Information Center.