The Remove-PoolEntitlement command uses the same format as the Add-PoolEntitlement command; however, if you are removing the last entitlements from the desktop pool, you must add the -ForceRemove $true option for the command to succeed. This prevents you from accidentally removing all entitlements from a desktop pool. The following code shows how this can be correctly implemented:

Remove-PoolEntitlement -Pool_id “EngineeringLC1” -sid (Get-User -Name “Engineering_Horizon_Users”).sid -ForceRemove $true

The Add-PoolEntitlement and Remove-PoolEntitlement commands require you to specify the user or group AD system identifier (SID) in order to add or remove desktop pool entitlements. For this, use the Get-User command within the Remove-PoolEntitlement command. Despite the name, the Get-User command is used to obtain both AD users and groups.