1.) Press the Windows key to open the Start screen or simply type the following into the Start bar gpedit.msc.
2.) This will launch the Group Policy Editor (gpedit.msc), which is a management console through which you can configure many Windows system properties or run scripts.
3.) Once the Group Policy Editor is running, navigate to: Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Connections.
4.) From here, first set the Restrict Remote Desktop Services user to a single Remote Desktop Services session parameter to Disabled
5.) Next, double-click on Limit number of connections and then set the RD Maximum Connections allowed to 999999.