Enabling Audio on Windows Server 2012 R2
First, open Server Manager by going to Start>Server Manager.
Once Server Manager opens, click on Tools in the top right of the window and select Services.
In the right pane of Services, scroll down to Windows Audio and double-click on it. In Windows Audio Properties, change Startup Type to Automatic and click on Start under Service Status. Once done, click OK.
Now you have audio enabled!