My app users, where I set the Amazon Cognito as Auth tool claimed they are not able to access to the app due to error messages. Concacted Appsheet support, seemingly there was some changes in settings which made a cause of this problem.
this should be common problem where you use Amazon Cognito as auth services to let your app users to access to Appshee App. Appsheet introduced Auth Group features (Dont ask me what is it, why they did… as I dont know) which give me problem.
By setting app up as above screenshot,the app run back to normal.
If you have apps with Amazon Cognito, I would suggest you have a look at this before your users start to claim the same.