If bought through a third-party vendor or the Microsoft Store, search your email for "Product Key" or "License Confirmation." These will provide a standard 25-character key that you enter directly into the "Install Licenses" wizard in the RD Licensing Manager. 4. Using PowerShell (For Active Servers)
If you purchased RDS licenses via retail (Box) or OEM (pre-installed with hardware), the key is physically documented. how to find rds license key