When you try to activate Windows Server 2012, you receive an error message that resembles the following:

Activation Error: Code 0x8007232b

DNS Name does not exist

Windows Server 2012 is trying to activate via KMS and it needs to be changed to your MAK key.

Change to Multiple Activation Key by going to Command Prompt and type:

slmgr -ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx

Where xxxxx-xxxxx-xxxxx-xxxxx-xxxxx-xxxxx is the placeholder for your MAK key