Yet another shoutout, and thank you, to Chromakode. That image saved me.
I was battling the input cover and bezel, both refused to sit flush. Once I lifted the webcam cable over the hinge, everything clicked into place on the first try.
Wanted to share because I experienced this on a new FW13 pre-ordered with the new display, received this week. No mention of this on the official guide(s), but I have now commented linking Chromakode’s post.