I nominate you.
Anyway, Denon does not use "HDMI-1", "HDMI-2", etc. for their input names, so it wouldn't make any sense for Harmony to put it that way in their database. There is NO SUCH THING as the "input for HDMI-3" because all of your inputs are ASSIGNABLE. As I explain in my setup guide, the only thing you should be worried about when configuring your inputs is WHAT NAME YOU WANT TO USE, and then you map the inputs as you need.
So you see, it makes zero sense to have "HDMI-3" in the Harmony database.... first off, who knows if there are even three HDMI inputs on a given Denon? Or what HDMI-3 is? If you want, say, the "VCR" input... well, that could be HDMI-1, it could be HDMI-2... it could be "Component-1"... plus "Optical-1:... or maybe it's an S-Video input plus "Coax-2". Who knows? Or let's say you have an "HDMI-3" command.... at the flip of a setting in the menu, HDMI-3 could be the VCR
As I say again and again, ALL OF THE DENON IR CODES ARE THE SAME ACROSS MODELS. So Harmony just reproduces a known set of commands in their database for the various models, but it's up to you to figure out exactly what everything does. At various times in the Denon history, they have had inputs labeled various things, and Harmony just accumulates the codes. Sometimes Denon changes their naming nomenclature (e.g. "TV/DBS" vs "CBL/SAT" vs "TV/CBL" or whatever) but the IR codes stay the same... you just may have to play around a bit and figure out what each one actually corresponds to. They support tens of thousands of devices and not everything is going to be 100% perfectly set up in their databases, it's a very powerful tool with a lot of setup flexibility and it's up to you to play with things and set them up correctly.