First you need to have a playlist library, if you don't have it, the following won't work.   Emby automatically creates a playlist library, but if you deleted like I did, you could just move all of your playlists out, restart the Emby server, then add the playlists back, then create a movie playlist.   After doing the above use an Emby client app, not kodi, and see if you have a "Playlits" library in your home screen, once you have the playlists library, go to Kodi and do the following.