If your dot can discover your hue bridge, then it can discover emulated_hue. To Alexa emulated_hue is a hue bridge. That’s why it’s called emulated_hue.
The only blip I had was my own fault, and detailed here…
I suspect that when people have called amazon support and been told that it’s not supported its because the ‘support’ staff have zero clue what emulated_hue is.
At least one person who’s spoken to the Alexa devs has been specifically told they don’t support the oldest API on the new Echos but currently have no intention of backdating that to older versions like the Gen 2 Dot.
There are some that I’m convinced it has failed due to them changing their network in some unintentional but fundamental way, a couple have admitted it coincided with router changes.
Personally, I’ve never had an issue with it on my Gen 2 Dots and Harmony Hub.