Would like to get unassigned IP address from static address pool with powershell

Using VMM and Hyper-V on 2012 R2.
I would like to get an available IP address from an static IP address pool and assign it to a nic on a vm:
$address = Get-SCIPAddress -UnAssigned -StaticIPAddressPool (Get-SCStaticIPAddressPool -Name "AddressPool")
$Adapter = (Get-SCVirtualNetworkAdapter -VM (get-vm -name "vmName")  | where  {$_.VLanID -eq "123"})
Set-SCVirtualNetworkAdapter -IPv4AddressType Static -VirtualNetworkAdapter $Adapter -IPv4Addresses $address[0].Address

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However the first line returns no address. If I use the option -Assigned, I will get a list of addresses already used, but I would like the -UnAssigned switch to work. I guess I could figure out what is unassigned if i know what is assigned, but that would be a workaround.
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itniflAsked:
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Dimarc67Commented:
Are you returning IP addresses to the unassigned pool?  Any chance that the unassigned pool is empty?
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itniflAuthor Commented:
What is an unassigned pool? I want to get unassigned IP addresses from a static IP address pool in VMM.
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itniflAuthor Commented:
Seems that there is no way to get unassigned IP addresses with this cmdlet. The -unassigned switch retrieves allocated addresses that have not been assigned to a resource: http://technet.microsoft.com/library/jj654453(v=sc.20).aspx
"Retrieves IP addresses or MAC addresses that have been allocated from an address pool but not assigned to a resource."
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itniflAuthor Commented:
Seems like that was the best possible answer
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