Let's Build
This section will guide you through creating a WPA2 Enterprise WiFi network using a Windows NPS server and a UniFi controller/AP.
There are folks out there still using this method and I would personally recommend moving away from this as it is legacy. A cloud RADIUS such as SecureW2 would be better suited.
This will require a Windows Environment with Active Directory, DNS Services, and a Certificate Authority before introducing the NPS role.