Can't submit apps to AppStore: ERROR ITMS-90534: "Invalid Toolchain

Question

ERROR ITMS-90534: \"Invalid Toolchain.

New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, macOS,

Answer 1

For anyone trying with Xcode 11, check the Xcode version. If it's Version 11.0 (11A419c) you cannot submit a build to the app store with this version. Get Xcode Version 11.0 (11A420a).

Apps built with Xcode 11 GM seed (11A419c) can no longer be uploaded to App Store Connect. You can now submit apps built with Xcode 11 GM seed 2 (11A420a) using the iOS 13 SDK and watchOS 6 SDK to the App Store.