Try like this, it works for VSS and VDS
$esxName='MyEsx'
$vmkName='vmk0'
$esx=Get-VMHost-Name$esxName
$vnicMgr=Get-View-Id$esx.ExtensionData.ConfigManager.VirtualNicManager
$vnicMgr.SelectVnicForNicType('vSphereReplication',$vmkName)
$vnicMgr.SelectVnicForNicType('vSphereReplicationNFC',$vmkName)
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