macOS Catalina 10.15.7 iOS 14.1 XCode 12.2 Windows -> Devices and Simulators -> (Right Click iPhone) -> Unpair Device (Xcode crashes) On iPhone, disconnect and reconnect USB. Trust this Computer? Trust Should now be able to build an run your app on the device.

Same issue here (are +1 posts helpful?).

Works for me now and was able to submit this morning. Also published another app which I needed to upload screen shots for, and was able to submit for review immediately.