Lack of knowledge with RD Licensing

This journey is a long one. I will try to make it short.

I have several VM’s and each one has the remote desktop licensing not configured pop up. I went a purchased 50 keys, then tried setting up a Licensing server but I have not been able to get any of my machines to connect to the license server and use it. At first I couldn’t get them to see it, I fixed this by making an AD DS forest and now they can see the sever but do not have the credentials to request licenses.

TLDR: Need to know what credentials are required for a AD DS computer to get license privilege. I am probably thinking about this wrong, I am pretty amateur at this.