I am running Xcode Version 11.0 (11A419c), and according to Apple we are able to submit our apps for iOS 13. I validate my app using the Xcode Validate App button and everything checks out fine. However, when I go and Distribute App, it proceeds until uploading where I am getting "Upload Fail" - App Store Connect Operation Error (An error occurred uploading to the App Store).
Is anyone lese getting this or is there something wrong with my app or environment?
Out of desperation I tried fastlane deliver for my binary. When I did that I got a java error, so I installed the latest JDK. I tried again and this time I got some other error, which lead me to this page
https://help.apple.com/itc/transporteruserguide/#/apdA3ae5a8b0?sub=apdA687d545d
I installed that and I was able to upload.
I am not sure if you need to install the JDK, hopefully this will cure your issues as well.
Let me know. Good Luck