I received that email from Apple encouraging me to submit my new iOS builds with the XCode seed version provided yesterday. And even the download website says:
Xcode 8 GM seed may be used to submit apps to the App Store.Yet when I do so and try to submit the new version with Application Loader (submitting directly on Xcode gave error 22421) I receive message:
Invalid Toolchain - New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, macOS, and iOS SDK. Don't submit apps built with beta software including beta macOS builds.
After having received a similar warning while uploading it. Anyone knows the meaning of this?
