When submitting a Mac app to TestFlight using the latest betas of Xcode and macOS (macOS 14 beta 6, Xcode 15 beta 7) I get the following error message:
Asset validation failed
This bundle is invalid. Apple is not currently accepting applications built with this version of the OS. (ID: fd741cba-f0da-4055-8bda-e8f7da257080)
However today there also was a TestFlight update with the following message:
You can now submit apps built with Xcode 15 beta 7 using the SDK for iOS 17 beta 7, iPadOS 17 beta 7, macOS 14 beta 6, tvOS 17 beta 7, visionOS beta 2, and watchOS 10 beta 7 for internal and external testing, […].
While it does not explicitly state that I can submit apps while on the latest beta, I highly doubt that many people are submitting macOS apps without running them on device. I suspect that most people are able to submit betas while running Sonoma?
I would expect this to have to do with the app containing a Finder Integration target and this being some weird edge case that Apple does not catch.
In this post @eskimo says that you cannot submit anything from the macOS beta? Is that true even for TestFlight builds? User @ingconti says in a reply to that post that they got it working.
(Side note: I already submitted this issue when it first happened, but I accidentally accepted a reply as an answer although it is not and I cannot undo it)