Xamarin app does not start after update in Apple App Store - ios

I released version 1.1 of my app in App Store a few days ago. In this version I added a splash screen and shell and changed the name of the app bundle to info.plist. With this, the name of the app is displayed differently than version 1.0. Also i added a support e-mail button to send the user email to me. Before releasing the update app, I tested it on physical iphone and simulators. Everything worked wonderfully. Now the app update is published in the store and when I update the app and start it, the splash screen loads but nothing more. The app just crashes and I can't see why. My question:
How can I find out why the app crashes? Are there logs from App store? Does someone have an idea where the reason can be?
Many Thanks

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