So I finally figured out a solution.
I got a brand new iPhone 13 today, and no Amazon app worked still. Was very frustrated. But then it occurred to me that it could be the VPN. All the Amazon apps on my way old iPad have been working this entire time. But I do not have the VPN turned on my iPad.
So I tried to switch off my VPN phone on my phone. However the VPN will automatically switch back on even if you try to switch it off. So what you have to do is: Go to settings>general> and scroll down until you see a separate VPN setting. Choose the VPN you have, go it’s settings by pressing the info/“i” button and switch off “connect on demand”. This will turn off the VPN and it won’t automatically switch on again.
after I did that, all the Amazon apps worked again! Had to re-sign in, but they work now.
the frustrating thing is, I was able to have my VPN turned on and all the Amazon apps worked perfectly fine in the past. Not sure why the VPN would stop Amazon apps from working, but not effect any other apps??? Maybe the Amazon apps aren’t working well with iOS 15? It all makes no sense to me, but maybe this solution will work for others.
Biggest downside of course is losing the privacy and protection you get with a VPN. So it may not be ideal for those who want a VPN on their phone. Though it could also be the third party VPN I have. I guess I could just delete it and see if I can switch the VPN back on and have the Amazon apps still work…
But if others don’t use a VPN on their phone then this might not help at all!