I am just using the standard Axis selection that I have in the past. I'm reasonably savvy and have used the software extensively with msfs2020. I've checked the triggers for the Stream Deck and assigned those (such as the parking brake) across two different aircraft (because my primary setup was the A2A which I thought might be the culprit, but I have the same issue with the standard Cessna 172). The parking brake button works on the stream deck, doesn't work on my TMaster quad... and AAO shows the light for on and off so it's seeing the hardware flawlessly, it's just not passing it to the sim.
Everything is properly in the denylist. Thing is as well, AAO can see the movement of the devices perfectly, for all I can tell AAO is running flawlessly, and it _must_ be connected because the Stream Deck is working (however it's integrated) I just can't get hardware to work!
I did not try random other axis potential as in the past I've never had issues with AAO and hyper-standard Axis like Aileron or Elevator. I will try that later today.