How fix Event source not licensed?

I am trying to run the Access Control Demo. Everything seems to work except that the events do not show up in Smart Client.

the log in XProtect Event Server/logs says:

Unable to handle EventOccurred event from access control system plugin. Event source not licensed. Demo Server: Demo System on 127.0.0.1 (2b813300-3845-2461-6007-235fdde0d393)

Seems this would be the problem. But what does it mean and what should I do about it?

If your XProtect VMS is not fully and correctly licensed this will occur.

The fastest and most effective help for this should be the license chat.

On this page you find the license chat as a small applet on the lower right..

https://www.milestonesys.com/support/