iOS 13 - How to Login in In-App Purchase Sandbox Account

iOS 11 - Is in app purchase testing using a sandbox user keeps asking to sign in for anyone else too? Forever loop?

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.

Trying to sign into Sandbox Apple ID in Settings leads to User name or password is incorrect.

I fixed it by logging into iCloud.com once using the sandbox account, then signing into the iPhone simulator.

(I tried accepting this answer, but it won't let me for 2 days :/)

Can't sign out of non existing sandbox account iOS 13.4

This could indicate that you have unfinshed transations in your payment queue. Try if looping in paymentQueue(_, updatedTransactions:) through all transactions and calling finishTransaction() on them fixes your problem.

Unable to log in with sandbox test users on device

Yes, the answer is I AM AN IDIOT... pure and simple.

I was setting my user account in itunes login to these test accounts.. which invalidates them as test accounts because they try to legitimately log into itunes...

You have to have your ITUNES/APPstore login EMPTY, do not try to log in explicitly in the settings... LOG OUT of ITUNES/APP STORE so that no account is in the apple ID in settings and then just run your app & login the test account via your app.

I had properly done this, but then without reconsulting the documentation I went to change users, and saw that I had a test user in the UI of the settings (I guess it gets set by the software) so I attempted to just set it there, and was invalidating the accounts causing this problem.

This is purely my mistake, but Apple could do a better job on the error this thing throws, and have the app store/itunes perhaps display something other than the test id, so if its been a week since or two since you set your test id and go to change it you don't just foolishly think you do it that way...

Anyway... you will likely need to delete all your sandbox testers if you did what I did as they will be invalid and then create new ones... and then remove the appstore/itunes login on your test device and try to run it....

I admit this is documented, I did follow it the first time I used a test user, but forgot the next time I wanted to test.. which lead to this... fully my fault.. but I suspect I am not, nor will I be the only one to do this... which is why it's so odd I couldn't find anything else documented about this error anywhere.

Documentation for reference:

• current: https://developer.apple.com/documentation/storekit/in-app_purchase/testing_in-app_purchase_transactions
• archive: https://web.archive.org/web/20171108103850/https://developer.apple.com/library/content/documentation/LanguagesUtilities/Conceptual/iTunesConnectInAppPurchase_Guide/Chapters/TestingInAppPurchases.html
  
  (Make sure to expand the : To perform testing for In-App Purchase products section)

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