Players can't go into dungeons

So the issue is that, when my players have the item from /md addkey, and they do /md play "dungeon name" it states this:

You do not have permission to do that (dungeons.play)

You do not have permission to do that (dungeons.play.send)

I'm not sure if I made some mistake in the commands and forgot to remove it, or it's a cooldown, or just no permission in the files. I'm not really good with these kind of things, so some help would be appreciated.[Legacy attachment omitted]