If you license is genuine and your server is connected to the internet you should be able to validate your license.
Windows server 2012 r2 standard evaluation activator.
Kms keys for windows 8 1 and windows server 2012 r2.
Activate windows server 2012 evaluation to full version.
As you can see the current edition is datacenter evaluation.
After the update and the new key installation your kms server will support client kms activation for all windows versions from vista up to win 8 1 2012 r2.
The edition will change from windows server 2012 r2 standard evaluation to windows server 2012 r2 standard.
It s a little more work than simply typing in a new product key.
Extend windows server 2012 r2 evaluation.
Following command will rearm your trial windows server 2012 r2.
Run command prompt with administrator privileges and run following command.
If you install windows server 2012 evaluation edition and later purchase a license the activation process is a little more confusing than you would immediately think.
The list of kms keys which should be used for window server 2012 r2 and windows 8 on kms server.
Then reboot your server.
You can rearm windows server 2012 r2 evaluation up to 5 times.
Windows will reconfigure itself.
First you must convert to a full retail version.
So open command prompt or windows powershell in elevated mode run as administrator and type dism online get currentediton as shown below.