I know that this thread is a year old, but I just ran into the same issue. Built my app (using Xamarin), latest XCode, brand new iMac. Uploaded to TestFlight and when testing it would crash without leaving any trace in TestFlight, app logs, or App Center Analytics (which I use to capture exceptions). It looked as if it never launched. I would get the splash screen for under a second and it would crash. Thanks to comments in here, I updated my min supported iOS Version from 12 to 13 and it now works. This will have no effect on my user base, but I can imagine it would cause issues for apps with a wider audience. Thank you to all