This is an old revision of the document!
NPS Service
Network Policy Service handles radius request and is used for controlling policy based access rules for network. This service exists only on Windows Server (2008-2019) operating system and does not require separate license.
NPS can log succesfull and failed authentication requests to Event Logs, Custom Views → Server Roles → Network Policy and Access Services
If loggin still does not work, from elevated commandline run
auditpol /set /subcategory:"Network Policy Server" /success:enable /failure:enable