WMI is sometimes found to be broken on XenApp Servers.
Here’s how to fix it:
Open an elevated command prompt, then:
Check if repository is corrupt:
winmgmt /verifyrepository
if yes do:
winmgmt /resetrepository
(You might get an error here in which case manually stop WMI service as it probably has a dependency, then try again)
This will do a reset. Now register the Citrix classes.
cd %programfiles(x86)%\citrix\system32\citrix\wmi
mofcomp citrix.XP10FR3.mof
mofcomp citrixProv.XP10FR3.mof
mofcomp metaframe.XP10FR3.mof
mofcomp metaframeProv.XP10FR3.mof
mofcomp mgmt.XP10FR4.mof
Still looking for the root cause of this issue and will paste it when I figure it out.