TestFlight App Shows Empty White Screen

When I install and open my React Native iOS app on my iPhone device using the TestFlight app, it shows an empty white screen. But, it works fine on my XCode Simulator and my iPhone device when run through XCode on both debug or release modes. What could be the reason for getting an empty white screen when running my app on TestFlight?

TestFlight App Shows Empty White Screen
 
 
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