FQDN hostname autoregistration

Hello guys

Actually i'm trying doing an autoregistration for our park, we work only with windows serveur so i'm trying to do an autoregistration i'm using this configuration 

Server=10...111
ServerActive=10...111

HostnameItem=system.run[powershell -noprofile -noninteractive -command "& gcim win32_computersystem -Property dnshostname,domain | foreach \{ ($_.DNSHostname + '.' + $_.Domain).ToLower() }"]

and when i'm launching it i'm getting this error 

2020/10/21 10:33:56.502272 cannot process configuration: cannot get system hostname using "HostnameItem=system.run[powershell -noprofile -noninteractive -command "& gcim win32_computersystem -Property dnshostname,domain | foreach \{ ($_.DNSHostname + '.' + $_.Domain).ToLower() }"]" item specified by "HostnameItem" configuration parameter: Invalid item key format.