If you use the NIC Teaming feature of Windows Server 2012, Windows 2012 will report only one adapter MAC address for the license. If you have many underlying adapters, the MAC address will arbitrarily change and Windows may pick one of the adapters that may no longer be licensed.
To resolve this issue, configure the MAC address property of the virtual team adapter. This property can be changed using the Advanced tab of the Adapter Properties as shown in the diagram:
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