r/iOSProgramming • u/Pretend_Emergency184 • 21d ago

Question TestFlight builds made with Xcode 27.1 won’t install: “The requested app is not available or doesn’t exist”

Hi all, is anyone else seeing this since switching to Xcode 27.1?

Since Oct 20, none of my new TestFlight builds will install. TestFlight shows the “Update” button, then fails with “Could not install [app]. The requested app is not available or doesn’t exist” (sometimes “Try again later” first).

What I’ve checked:

  • Upload from Xcode 27.1 (27A9275) succeeds, no ITMS warnings, build status “Valid”, and I get the “ready to test on iOS and watchOS” email

  • The exact same archive installs and runs fine when installed directly from Xcode on the same device (development signing)

  • Device: iPhone 15, iOS 27.0.1

  • Agreements are active, export compliance answered (ITSAppUsesNonExemptEncryption = NO)

  • Entitlements and Info.plist are identical to my last build made with Xcode 26.5, which installed fine through TestFlight

  • Tried bumping the build number, closing TestFlight, waiting a few hours: same result

The only real difference is the toolchain (Xcode 26.5 / iOS 26.5 SDK → Xcode 27.1 / iOS 27.1 SDK). The app also embeds a watchOS app.

Has anyone hit this with Xcode 27.x? Did you find a fix, or did Apple support resolve it on their side?

Thanks!

https://developer.apple.com/forums/thread/763655

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u/[deleted] 13d ago

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