iOS App fails to launch - looking for pointers on where to look

My app builds fine, but as soon as it runs, the debugger terminates and the app stops. I'm trying to look at relevant logs, console output, etc, but I'm not really able to see anything obviously wrong. Can someone help me here? If it helps, I'm having the same issue on Visual Studio. Using Xcode 12.4 on iPhone Simulators using  14.3, 14.4, etc. Please let me know if there's any more information I can provide.