NEC Express5800 Series Installation Manual page 51

Chapter 1 Installing Windows
11. On the next screen, choose your country, and then click Next.
Get the installation ID required for license activation.
12. Call the Microsoft license activation hotline and then tell your installation ID.
Type the confirmation ID, and then click Activate Windows.
The authentication is now complete.
Express5800/R110j-1 Installation Guide (Windows)
Installing Windows Server 2016
51