Per User CALs are not auto-applied — they require tracking in AD or manual installation. Registry only stores the mode preference. Fix: Ensure Per User CALs are actually installed on the license server (RD Licensing Manager → Install Licenses).

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService\Parameters\License

Registry edits are usually a "last resort" for troubleshooting RDS licensing . Use them if:

The Windows Registry does not typically store the actual RDS CAL (Remote Desktop Services Client Access License) in a plain-text format that can be easily copied or transferred. Instead, the registry stores the and licensing identifiers that verify the license's validity with the Microsoft Clearinghouse.

Editing the Windows Registry carries risks. Incorrectly modifying or deleting registry keys can cause system instability or prevent the operating system from booting. Always back up the registry before making changes.

It is a common misconception that you can back up the registry key and restore it to a new server to transfer RDS CALs.

If you need the Windows Registry location used by Remote Desktop Services Client Access Licenses (RDS CALs), the relevant key for the Remote Desktop Licensing Grace Period and licensing configuration is: