Guideline 2.1 – Performance – App Completeness
We discovered one or more bugs in your app when reviewed on iPad running iOS 11.2.6 on Wi-Fi connected to an IPv6 network.
Specifically, your app displayed a white screen after launch. 
Please see attached screenshots for details.
Next Steps
To resolve this issue, please run your app on a device to identify any issues, then revise and resubmit your app for review.
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