That’s one of the CIM cmdlets that were added in Windows Server 2012; they can’t be used to manage downlevel DHCP servers, because the necessary WMI namespaces / classes don’t exist on older operating systems.
For older computers, netsh.exe offers quite a bit of functionality (though it’ll be giving you text instead of objects.) For example:
netsh dhcp server \DHCPSERVERNAME v4 scope xxx.xxx.xxx.xxx show clients