Deploying a new VM from template in VMM requires a PID for Windows Vista and Windows Server 2008... but your environment uses KMS for activation

Check out the following document for a set of public PIDs that you can use in the OS profile: https://download.microsoft.com/download/4/5/f/45fb677a-c215-442e-afd0-419e08b6c5d1/Volume%20Activation%202.0%20Deployment%20Guide.doc

KMS Client Setup Keys

By default, Windows Vista and Windows Server 2008 operating systems use KMS for activation. You can change the activation method of a KMS client to MAK and then change it back by installing the corresponding product key. Table 2 lists the KMS client setup keys for Windows Vista and Windows Server 2008 volume editions.

Table 2: KMS Client Setup Keys

Operating System Edition

Product Key