For KMS:
If you are using Volume Licensing, use the generic KMS client key first, then activate: windows server 2016 evaluation to standard
This process requires a reboot. It only works if you are still within the initial 180-day evaluation grace period. It converts your installation to a retail (or volume license) Standard edition using a DISKPART method. Text: Converting Windows Server 2016 Evaluation to Standard Step 1: Check Current Edition & Status Open Command Prompt (Admin) or PowerShell (Admin) and run: For KMS: If you are using Volume Licensing,
DISM /online /Set-Edition:ServerStandard /ProductKey:XXXXX-XXXXX-XXXXX-XXXXX-XXXXX /AcceptEula Replace XXXXX-XXXXX-XXXXX-XXXXX-XXXXX with a valid Standard edition product key (Retail or MAK). A generic KMS client key will not work for this retail conversion. If you do not have a retail key, you must use the Volume/LTSC method (Step 3b). Text: Converting Windows Server 2016 Evaluation to Standard