Willing to take a vouch for 2012 R2. Thanks!
VOUCHERS Key sent to jimhsu
Keys received, everything works well. Data on the key received:
Description : Windows Server 12 R2 RTM ServerStandard Retail
Edition ID : ServerStandard
Sub Type :
X18-90726
License Type : Retail
Channel : Retail
Helpful Note: if you're using a version of Server 2012 on VM and receive activation errors, you may have a wrong edition of Server installed. Check/verify with instructions from here: https://cm.ahnat.pl/windows-2012-r2-activation-0xc004f069/