A tracking tool for RDS CALs issued by the Remote Desktop License Server is included with Microsoft RDS. The Remote Desktop Licensing Manager is a tool that is only functional if your company does not make use of Azure AD Domain Services.
If you choose to use Azure, you can manually monitor licensing by employing other techniques, such as querying active connections created through the Connection Broker.
You have the choice to specify the report’s scope by domain, the domain’s organizational unit, or the full domain and all of the trusted domains underneath before the Per User CAL Usage report is generated.
If you choose the last option, be aware that the report may take a while to create because it covers so much ground in your industry.
Does RDP require a license?
Yes, A client access license is required for each user and device that connects to a Remote Desktop Session host (CAL). RDS CALs are installed, issued, and tracked via RD Licensing. An RD Session Host server determines whether an RDS CAL is required when a user or device connects to it.