Is Amazon Prime Video App streaming in 4K to Apple TV

I solved my issue by installing an Apple TV update that I did not know was pending. Works fine now. Strange how that fixed it as non 4K prime was just fine.

I've downed the update and mine still just hangs. 4K on everything else plays fine.

Same here. Samsung 4K tv, but pre-HDR. All 4K steams fail to start when using Prime app on Apple TV (4K). Yet I can use the Prime app that is on the tv itself and watch 4k videos with no problems.

Doesn't work for me. My Samsung tv is 4K but not HDR. Is that the problem? Prime app installed on TV works with 4K, just not the app on the Apple TV (4K).

Same here. No 4K, no 5.1. The app installed on my Samsung 4K (non HDR) works fine - 4K and 5.1.

Same situation here. Prime app on Samsung can stream UHD. On Apple TV 4K, it just hangs. Apple TV is updated.

Me too. Interesting process to be a part of.

I have same issue ... Sony TV 4K but not HDR. When I try to stream UHD movies from Amazon Prime Video .. it just hangs on a black screen with a box in lower corner ... non-UHD works fine.

Apple, if you're listening, there might be a common thread here. Several people, including me, have mentioned that the tv's they are using with the ATV4K are 4K but not HDR compliant.

FYI ... Figured out my issue. My Sony has 4 HDMI ports ... only PORT 1 and PORT 2 support HDCP. Once I moved my AppleTV to one of those ports Amazon Prime UHD streams just fine ..

Glad to help!

I had to go to my receiver and make sure the input I was using was hdcp compatible. All my tv inputs were but only one of my receiver HDMI inputs were compatible. Thanks for the tips.

Oops. Just read here about HDCP... doesn't seem my TV has a HDCP port?

HDMI 4 worked for me too. Thanks for the simple fix.

This was my problem too, set Apple TV back to 4K HDR and Prime Video in 4K works !!!