Plex for Kodi with internal Dune-HD player does not work

hello I have a Dune-HD pro 8k Android media player and Kodi 21 installed. I have defined the internal Dune Player to play the videos with the playercorefactory.xml file (better picture for DV and HDR UHD) all videos are played cleanly. If I now install Plex for Kodi and then click on a film, the Dune Player starts, but nothing happens. Does anyone have an idea why this isn’t working? Do I have to define something here again that Plex for Kodi recognizes in order to use the internal Dune Player and not the Kodi Player