Log in to the instance that has the license server role installed. Usually your Broker server (ASTBRK001) has this role assigned.
Follow the steps below to install the CALs:
On the license server (usually the first RD Connection Broker), open the Remote Desktop Licensing Manager.
Right-click the license server, and then click Install licenses.
Click Next on the welcome page.
Select the program you purchased your RDS CALs from, and then click Next. If you are a service provider, select Service Provider License Agreement.
Enter the information for your license program. In most cases, this will be the license code or an agreement number, but this varies depending on the license program you're using.
Select the product version, license type, and number of licenses for your environment, and then click Next. The license manager contacts the Microsoft Clearinghouse to validate and retrieve your licenses.
Click Finish to complete the process.
This process can be applied to the latest versions of Microsoft Server starting with 2012.