Amazon Prime Video on SmartTV

Just replaced my LG OLED with the Sony XR 65 A90J

same problem as mentioned above - no Amazon Prime - the App was running out and did not connect.

tried  everything !!  except hard wire changes !!  After two day of searching and wasting my time, I tried the new Fire stick, what I bought 4 weeks ago for my older Sony Smart TV from 2014. 

Guess what - Amazon prime is working and all the other Apps via the Fire stick!!!  I do not really know, why!!

I am still thinking to send the new Sony TV back (to make a point) 

maybe this will help someone / somewhere 

As mentioned above, the issue seem to be that the Gateway defaults to IPv6 protocols but Prime ONLY uses IPv4. 
The solution is to set your home network router to use IPv4 and not v6. This cannot be set on the Gateway. 

If you aren’t using a home router and the Gateway is your internet wireless device, your only option is to use a device like a Roku or Apple TV instead of your smart TV for Prime. 
Other streaming services such as Disney, Netflix and Hulu work with the Gateway and the IPv6 configuration. 
It’s an issue that either Prime or T-Mobile will have to fix. 

@Marion There does seem to be an incompatibility specifically with the Prime Video app on Sony Smart TVs with T-Mobile Home Internet.  There are several discussions here about it, and I have suggested before (though not on this particular thread) that the fix is to use a Firestick or Roku.  I'm glad that you found that works for you, and that you posted here.  Returning the TV won't really make a point.  It will get resold as an "open box" or possibly refurb item.  The programmers will never know why you returned it.  If the picture is great, that is what matters!  The TV's OS will eventually be outdated, but can always be replaced with a current external streaming device.

this seems to beissue calll me adam urango

I have the Arcadyam KVD21 Gateway and a Sony Bravia TV, all connected to an eero 6+ router system. I have never had any problem with the Prime Video app on the TV.  It's the Apple TV app that won't work.  Constant pixelating problem!  Can't watch anything.

I am experiencing the same issue - all apps EXCEPT Prime Video play on Sony Bravia smart TV when connected to TM Home Internet (TMHI) but will play when connected to TM Hotspot.  I have 2 Sony TV's and PV will not play on either but all other apps will.  I have also connected to the PV app on my Samsung Galaxy S22 Ultra phone via TMHI WiFi with no issues and my husband connects same on his Galaxy table with no issues.  After troubleshooting with Sony, I was convinced it was strictly a TMHI conflict but since the PV app works on these 2 other Android devices, I am back to it must be a Sony TV issue and/or TMHI.  Both Sony and TM want to point fingers at the other one rather than helping their customers solve this issue which many users are experiencing.

Thought I would weigh in on this topic since I have the same problem with TMHI and Amazon Prime video. The prime app will load (slowly) but refuses to play videos (or trailers). My set up is tmhi Sagemcom gateway, TCL smart TV, and I just got the new Onn 4k pro streaming box. Everything works except Amazon. The Sony TV in the bedroom has a Google chromcast and it does not play videos on Amazon Prime either. Please TMO try and solve this problem, it's for real. 📺