Here is the text for converting a Windows Server 2016 Evaluation copy to a full Standard edition.
Execute the conversion command:
Run the following command to see which edition you can convert to: windows server 2016 evaluation to standard
DISM /online /Get-TargetEditions You should see "ServerStandard" listed. Here is the text for converting a Windows
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). windows server 2016 evaluation to standard
If you are using Volume Licensing, use the generic KMS client key first, then activate: