Person Match Service Licenses
The Video Analytics (IDLA) and Person Match Services use and share the ISS VA license. If you are already using the IDLA, the PM service is provided as a free upgrade.

Even when adding multiple PM service in a single Admin Service, it is used as the total number of channels purchased.

As PM service is in Federation, the IDLA license for PM service should be included to Federation license,
As PM service is in Admin, the IDLA license for PM service should be included to Admin license.