Background: Active Directory allows administrators to create a hierarchy within a domain that meets the needs of their organization. The object class of choice for building these hierarchies is the class organizationalUnit (OU), a general-purpose container that can be used to group most other object classes together for administrative purposes.
The symbols like under score "_" or dash "-" are prohibited in the Active Directory OU name and this is the reason why SmartEndpoint scanner fails to count the number of the machines in that Active Directory OU.
Check if there are these symbols in the Active Directory OU name and remove them if they exist.
This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.