I am testing a non-consumable IAP on an iPhone 6s running iOS 11 GM. Whenever I tap my "Buy" button, it asks me to sign in. I tap "Sign in with existing apple ID" and enter my sandbox user details (which worked fine as of a few days ago on iOS 10).
After entering, it just goes back to the same "Sign in" screen. I tried entering a few more times and it just goes back to the same screen again. Keeps looping forever.
Is this down for anyone else?
Fixed as follows
If it does not work after few day try new account.
The only way works for me is erase all phone. I tried logout, login to sandbox account and restarting the phone but didn't work.
Please make sure all your data is back-up.
Settings -> Reset -> Erase All Content and Settings
Go to Settings--> iTunes & Appstore scroll to bottom.
Sign out the existing account if any.
You can add account here for sand box purchase.
The same thing happens for me, for three separate sandbox users which were created before iOS 11 release. (The problem seems prevalent on iOS 11, there are posts on reddit and apple forums reporting this issue)
It seems creating new fresh sandbox user is the way to go. Sandbox users created after iOS 11 release work, while those created before the release cause "Sign in/Create Apple id" alert loop.
I did this steps and it's works