Does this work for you ?
$si=Get-ViewServiceInstance
$extMgr=Get-View-Id$si.Content.ExtensionManager
$extMgr.ExtensionList |where{$_.Key -eq'com.vmware.vcIntegrity'} |
Select @{N='VUM Server';E={($_.Server |where{$_.Type -eq'SOAP'} |Select-ExpandPropertyUrl).Split('/')[2].Split('.')[0]}}