Hi,
Please be informed that there is no way to limit terminal users to the same amount of cal licenses if your licensing mode is per user.
To ensure you are in compliance with the Remote Desktop Services license term, you need to have enough RDS Per User CALs installed on the license server for all of your users. That means if your organization has 30 users need to remote connect the RDS server, you must purchase 30 CALs.
Even if a user disconect, the CAL issued to him cannot be revoked and assigned to another new user.
For your reference.
https://learn.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-client-access-license
Thanks,
Eleven
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