Premium Module Hosting - CD Key Issue

If I host an Infinite Dungeons game (using dedicated server - another machine on the LAN) and then try joining it, I get the error shown below:

Is there a fix for this or am I doing something wrong? It only seems to happen with Premium Modules, the main campaign etc seem to host perfectly fine.

Is there a fix for this or am I doing something wrong? It only seems to happen with Premium Modules, the main campaign etc seem to host perfectly fine.
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http://steamcommunity.com/games/704450/announcements/detail/1658886571694616501