Hello,
I've submitted our new App to App Store Connect, and receive the following error message from Apple: "We were unable to sign in to review your app with the demo account information you provided."
I've got the exact same version of the App on my (real) iPhone and can login with the same Credentials without a problem. The debug information from the Screenshot Apple provides that it didn't even connect to our server - so the login wasn't recognized as false but the app couldn't connect to the server.
We're using normal Authentication (using a Authentication header and https). Could there be a reason why Apple can't connect to our server but all testers can?