Administration Groups can be used in combination with target properties. Is it possible to set some property fields of targets to required (mandatory) fields. This way it ensures that ALL targets are in some group or another. Now it is possible to have targets which are not in a AG. We use the groups to count targets for billing the customers.
This is not supported today. Target properties are optional fields in the current release. We do have reports today that tell you which targets are not in any Admin Group. Perhaps you can use that report for now. Thanks.