video lessons not working in iOS


Must have been a bug that allowed you to watch before. Videos have always been a diamond only feature except for a few absolute beginner lessons.
https://www.chess.com/membership?c=navbar
and
https://support.chess.com/article/471-how-do-i-subscribe-to-the-chesscom-video-lessons

You can watch videos that are part of lessons, if you have available lessons for the week. However, watching at all from the Video section requires Diamond.
I asked, and there may have previously been a bug that was allowing non-diamond to watch videos, but that has been fixed.