Did you find anything? I am having issue.
App Rejected Unable to Login into account for review
With the information you provided I can't tell you much.
It seems your app has a login system (am I wrong?). When you submit your app for the review you need to provide a working username and password to the team, so they can access to the app and complete the review process.
Make sure that during the review the system you use to manage the logins (servers or whatever else) is active, so that the verification team can log in successfully.
You can provide these information in the dedicated section on the App Store Connect.
It seems your app has a login system (am I wrong?). When you submit your app for the review you need to provide a working username and password to the team, so they can access to the app and complete the review process.
Make sure that during the review the system you use to manage the logins (servers or whatever else) is active, so that the verification team can log in successfully.
You can provide these information in the dedicated section on the App Store Connect.