Unresolvable user groups are user groups that can no longer be found in the LDAP directory that was designated as their identity source.
A user group becomes unresolvable for any of the following reasons:
The user group is deleted from an LDAP directory.
The user group is moved.
The scope of the identity source is narrowed so that it no longer includes the user group.
The Search Filter of the identity source is modified so that it no longer contains the user group.