Refer the article: Visual Studio subscribers can increase the number of users who can access a Windows Server via RDS by entering a product key supplied in the My Product Keys tab on the Subscriber portal. To obtain a product key, connect to the My Product Keys page and scroll down to the version of Windows Server you are running. Locate “Windows Server R2 Remote Desktop Services connections” and click the “Get a Key” button.
A Windows System Admin's Blog Covering Server Administration, Endpoint Management, Scripting and Network Management How to reset the Remote Desktop Server Licensing Grace Period on Windows Server 2012 with Remote Desktop. May 22, 2018 - In this article we'll consider the installation, configuration and activation of Remote Desktop Licensing role on Windows Server 2016, as well as.