In the first post I accidentally clicked "Post" before I could finish it.
In the puzzles tab when you click "custom" and then "en passant", no matter what range of difficulty range it is set to, it will not give you any puzzles.
When I saw this post, I ameditly tried it out and the same thing happened (only I didn’t try the difficultly range thing) To be honest, I don’t know why this happens. But if you want any en passant puzzles, you might be lucky if you find them in this section of the different catorgories (more puzzles) But yeah that’s a bug that we should report to the Chess.com team. Take peace!