DirecTV devices stopped working on Fire TV

We have three of the devices that plug into the HDMI port in our household and they have worked fine for six months on three different TVs (one Fire TV and two Roku TVs).

Three days ago the one on the Fire TV in the bedroom stopped working. I've tried it in all three HDMI ports and I get the error message "no signal detected".

I am in IT and I know how to troubleshoot, so I swapped it with a device that was downstairs and working on the living room TV and device works.

I brought living room device upstairs and tried it in all three HDMI ports and again same error "no signal detected".

So I thought well there's something wrong with my HDMI ports, I'll reset the Fire TV to factory defaults.

After doing that, same error "no signal detected". I plugged in another device (Blu-ray player) and it works fine in any HDMI port of Fire TV.

So it's not the Fire TV HDMI ports and it's not the DirecTV device so what the (Edited per community guidelines) else can it be??