The RD Licensing grace period has expired and the service has not registered with a license server with installed licenses. An RD Licensing server is required for continuous operation. A Remote Desktop Session Host server can operate without a license server for 120 days after initial start-up.
The official solution is to Activate the RDS/TS CAL License server and point the Server to the License server with User/Device License and will resolve the problem
But if you want to reset the timer and again avail 120 days grace time here is the solution
The solution is to delete the REG_BINARY in:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\RCM\GracePeriod
To delete the key you must take ownership and give admin users full control.
After a restart, the server will reset the grace period to 120 days.
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