Hello,
If you need more than two concurrent users to log in at the same time, you need to configure the session host role, license server, and have a sufficient number of CALs with the required versions, and configure them correctly.
In an RDS environment, RDLS installs and publishes cals, and SH can only point to LS for cals to be issued normally.
跨域林或工作组设置 RD 许可 - Windows Server | Microsoft Learn
Since the installation and activation problem of cal is not within the scope of Windows technical support, please contact clearing house to solve the problem of cal activation.
Remote Desktop Server Licensing (microsoft.com)
You can also make a call on the CAL import screen.
The contract ID and number that will need to be provided at the time of activation will need to be consulted with your incident manager.
I hope this information helps.
Best regards,
Jingjing Wu