Bellow is the message from Apple. I have not yet tested it on an iPad myself on an IPV6 network since I don’t have one.
I am not exactly sure what is happening.
Guideline 2.1 - Performance - App Completeness
We discovered one or more bugs in your app when reviewed on iPad running iOS 10.3.3 on Wi-Fi connected to an IPv6 network.
Specifically, the app does not load any content.
The steps to reproduce are:
- Launch the app
Please see attached screenshots for details.
To resolve this issue, please run your app on a device to identify any issues, then revise and resubmit your app for review.
If we misunderstood the intended behavior of your app, please reply to this message in Resolution Center to provide information on how these features were intended to work.
For new apps, uninstall all previous versions of your app from a device, then install and follow the steps to reproduce the issue. For updates, install the new version as an update to the previous version, then follow the steps to reproduce the issue.
For information about testing your app and preparing it for review, please see Technical Note TN2431: App Testing Guide.
For a networking overview, please review About Networking. For a more specific overview of App Review’s IPv6 requirements, please review the IPv6 and App Review discussion on the Apple Developer Forum.