Dan

That helped, the fire stick responds to the d-pad and OK from the fire stick device page, but not from the activity. That is a Harmony issue that I can fix. I'm not getting a response to the number keys though, even from the fire stick device page.

I am sooo lost. I have a Harmony 650 that I'd like to use with a Fire Stick 4K Max and LG UJ6200. In the past I used an IReTV with the 4K non Max stick. I thought the Flirc USB would be better, but I just can't seem to figure it out. I have the Harmony app and Flirc app loaded on my Win10 laptop and they both see their devices. I updated the Flirc firmware via the prompt when first starting the app. I also created an activity on the remote using the UJ6200 and Flirc FireTV devices. Nothing works. The remote indicates it is sending IR commands but nothing happens on the Fire Stick. Help.....

YMMV, but on my 50U6HF the remote falls back to IR if the TV power is unplugged.