CmdID / PowerShell / Cmdlets / Set
Set-RDPersonalSessionDesktopAssignment
Associates a personal session desktop assignment with a user. Windows Server PowerShell reference
From the Windows Server PowerShell reference 4 parameters Its page in the reference
Parameters
-CollectionNameSpecifies the name of a personal session desktop collection.-ConnectionBrokerSpecifies the Remote Desktop Connection Broker (RD Connection Broker) server for a Remote Desktop deployment.-NameSpecifies the name of the personal session desktop assignment to set.-UserSpecifies a user account in DOMAIN\user format.