I have an Apple TV 4K with Mrmc running on it, connecting to Emby server running on Windows Server.
The Yaste app is able to control the basic playbacks of Mrmc. But the Movies/TV Shows library always shows “No media” after sync. It is the same if replace the Mrmc with Kodi on my Android TV.
Is there some setting I missed to get it working?
Without the mandatory logs asked in the issue template not much I can tell 
The library part of Yatse displays the library part of the media center if the Emby part is not added to their library then it will be empty.
But Yatse have native support for Emby that will be way more efficient that adding Emby content to Kodi and control from Yatse.