Thanks for the response. Please find the rejection message below.
We also discovered one or more bugs in your app when reviewed on iPad and iPhone running iOS 9.3.5 on Wi-Fi connected to an IPv6 network. Specifically your app launches to a blank white screen with no content.
We've attached screenshot(s) for your reference.
Please run your app on a device while connected to an IPv6 network (all apps must support IPv6) to identify the issue(s), then revise and resubmit your app for review.
The vast majority of problems like this are caused by server-side configuration problems, possibly in the server itself but most commonly in the DNS. Have you read through the my Supporting IPv6-only Networks pinned post? What do you see when you work through the steps outlined in the post linked to by FAQ#6?
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"