Any ideas of things to look for? I have subtitles set to “display for foreign audio” and my language above and below are “english”. And I just looked in the mkv and it has the “default” and “forced” flag actually set, not just in title of the track. I think the file also has an “english” entry separately though (yep in another player…it has 2 other “english” entries).
I’m playing on an Xbox One X if that matters, with the official app.