After selecting the "UsersStatus" action for a user/group in the WCC WidgetAccess policy in EEM, the "Active Users" widget is still unavailable to that user/group when looking under the "Add Widget" menu under the Dashboard tab.
The information provided by the "Active Users" widget is only available to a user/group that has been granted "Configuration" within the WCC ApplicationAccess EEM policy. Therefore, for a user/group to have access to this widget, they must have both the "UsersStatus" access within the WidgetAccess policy and "Configuration" within the ApplicationAccess policy.