After a Mobile app is released to Apple TestFlight for testing, you can see and warning sign on TestFlight "Missing Compliance". When you click on it, it shows "This build is missing export compliance information. Provide Export Compliance Information.
You have to click the link each time and select Yes or No, only after that, your tester can see the build. This is quite annoying if you want to get your build delivered as soon as possible.
The solution is add the following setting to your iOS Info.plist: