Block Puzzle Jewel
Instead of direct registry manipulation, use:
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).
HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod
This is the most critical location for troubleshooting "The remote session was disconnected because there are no Remote Desktop client access licenses available" errors.