This Remote Desktop license server could not notify other Remote Desktop license servers that new Remote Desktop Services ...

This Remote Desktop license server could not notify other Remote Desktop license servers that new Remote Desktop Services client access licenses (RDS CALs) have been installed and added to its licensing database. If the problem persists, free up available memory if memory is low on the Remote Desktop license server, and identify and resolve any network connectivity issues, specifically with firewall configuration. Problems with remote procedure calls (RPCs) might also cause this issue.