I can't get the Xbox app to work on my Fire stick TV and I really need help!

It's not compatible, so it won't work

I have a Amazon fire stick and I have just connected it directly to the back of the tv. There’s no need for it to be connected thru the Xbox as there is a app specific for Amazon prime video.

I've been having similar issues. I was able to cast from my Windows 10 machine to my Xbox several times last week, it worked seamlessly and great. Today I've been trying again and I can't get Windows 10 to see my Xbox. I've switched to using my Fire TV
Stick which works, but is very slow. Maybe MS updated the "Wireless Display" app since it last worked and broke it?

Ive been tweeting about this posting in the preview forums its getting old for two paid services. This needs to get fixed sling work great on my fire tv stick

The firestick should work. From some research I’ve done they say

“You have to go into one guide and it should be at the very bottom on the HDMI channel.”

“I did manage to get it to work and it’s basically just as this person said, plug it into the HDMI on your Xbox, press the power button on your fire stick then open one drive (probably a one guide typo)
on the Xbox and it should all be working!”

“You need to run the TV set up. It'll ask if you have a cable box or something, and set up the one guide (TV guide) then after it should work. I switch between fire stick, Chromecast, and switch on my input.”

I don’t have one to try but I hope this helps.