This Remote Desktop license server is too busy to notify other Remote Desktop license servers about the number of licenses ...

This Remote Desktop license server is too busy to notify other Remote Desktop license servers about the number of licenses that it has in its database. It will attempt to notify other Remote Desktop license servers later. If the problem persists, free up available memory if memory is low on the Remote Desktop license server, and identify and resolve any issues with network connectivity, specifically with firewall configuration. Problems with remote procedure calls (RPCs) might also cause this issue.