Guideline 2.1 - Performance - App Completeness. Specifically, your app was unresponsive upon launch. Please see attached screenshots for details.
Specifically, your app contains placeholder content. Specifically, we found that after the splash screen is displayed, a blank white page is displayed and no further action takes place to continue with the review. Before we can continue, we need a video that demonstrates the current version in use on a physical ios device.
Guideline 2.1 Performance App … Apple Developer Forums
Specifically, it appears your app accesses or includes paid digital content or services, and we want to understand your business model before completing our review. The recommended approach is for your production server to always validate receipts against the production app store first. Specifically, your app was unresponsive upon launch. We discovered one or more bugs in your app when reviewed on ipad?