The paper jams right at the exit. Indeed it looks like the rollers do not engage as the paper is trying to exit and the paper crumples up.
The Duplexer is installed properly as best I can tell. It shows up on the status page (albeit a crumpled status page).
From what I found online, Diagnostic mode is entered by holding the up and down arrows while powering on. Don't know what to do with it though.