Windows Server 2012 R2 with GVLK – no Grace expiration date

I have installed Windows Server 2012 R2 using volume license media, using GVLK durring setup. How can I check what time do I have to activate, before the OS starts to shutdown every hour? I have tried slmgr.vbs -dli, but there is no time remaining. I have also tried the Volume Activation Management Tool, but the Grace expiration date column is empty.

https://social.technet.microsoft.com/Forums/en-US/1a357854-4395-4fe1-9d4e-5461a6420016/windows-server-2012-r2-with-gvlk-no-grace-expiration-date