Thanks for the post and the details, the error is not about having the latest version of Xcode, looks like you do have it as Xcode Version 26.2 (17C52). The error message you're encountering, ITMS-90426: Invalid Swift Support - The SwiftSupport folder is missing., indicates that your app submission to App Store Connect is missing a required folder named SwiftSupport. So this is extremely interesting to me for sure. When archiving your app, ensure there are no build warnings about folders. Go to > , and then check the Organizer to ensure everything is correctly packaged. If your app uses Swift Package Manager, ensure that all packages are updated and correctly integrated. Sometimes issues arise from improperly configured packages? I believe this issue is always about packages you are using. Can you check that? read until the end where a post from an Apple engineer will give you more information. If you're manually managing your app bundle, ensure the folder is present in the archive's structure. It
Topic:
App Store Distribution & Marketing
SubTopic:
TestFlight
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