Is anyone having problems with changing languages?

I have a few episodes of a tv series that are both french and english. The tv shows by default are in french. I go into the drop down to change the language to english and the language does not change. It does work on my ruko plex app just not my xbox one plex app.

I read this somewhere …

Does it work if you change to englisch => back to french => and then again back to englisch?