I tried to upload the app build using Xcode but I got this error \"no accounts with itunes connect access\" I then tried to upload the IPA using application loa
For me just log out on Web iTunesConect / AppsoreConnect portal.
Quit Xcode (if Possible restart) and then upload the build.
If you close all the other app and upload build in sylo makes a job easy.
Also using the "Application Loader" is a Good Solution!