Hi Yosevan
Windows remote is using wmi to discover accounts remotely. The problem may be there. You can do a very simple test connecting from a windows machine to the remote system using wmi and getting the list of users. So assume you want to use local accountA in machineA to manage the local users there. To see if it is able to discover them you can try, from a Windows machine
wmic --> it will start the wmi client interface, wmic
wmic>/node:"machineA" /user:accountA useraccount get name
This should return the list of users that may be retrieved by using wmi. You can try it first with a working system to see if it returns the correct information, then with the problematic system. If it does not work, then there is something with the permissions of accountA that does not work right