If your app has customer accounts enabled, please make sure to provide Apple with demo login information.
Unfortunately, Apple does not register during the review process and they will need demo information to see the account's functionality in your app.
1. Proceed to the accounts login page in your preview app or in your web checkout.
Tap the signup button and enter any demo email and password.
2. Click the register button and remember the credentials you entered.
3. Login to AppStore connect after we have successfully built your app and have emailed you. Click your application.
4. Scroll down to App Review information, check the box for sign-in required, and enter your credentials below. Make sure to save your changes on App Store connect.