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.

  • Click Next.

  • 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.

source: Install RDS client access licenses | Microsoft Docs

This process can be applied to the latest versions of Microsoft Server starting with 2012.

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