According to the release notes, builds of iOS 10 Beta apps should work on TestFlight: https://developer.apple.com/testflight/release-notes/
However, when I submit them, I get this error: ERROR ITMS-90534: "Invalid Toolchain. New apps and app updates must be built with the public (GM) versions of Xcode 6 or later, OS X, and iOS SDK or later. Don't submit apps built with beta software including beta OS X builds.
... This app is "distributed for beta testing" and I want to submit a new build. Does anyone have a solution for this?
I think it's because I'm using Xcode8 Beta 5, not Xcode8 Beta 6.