[UE 5.4 iOS] Unknown Cook Failure During Packaging – App Store Also Requires iOS 18 SDK

Sorry for the late follow-up. I’ve followed the suggested steps and here’s what I’ve confirmed so far:

  • The BlueprintHttp plugin is correctly listed in the .uproject file.
  • The plugin’s .uplugin file includes "SupportedTargetPlatforms": [ "IOS" ].
  • Please let me know what specific files or structure you’d like me to check inside the Binaries/ directory.
  • This issue only occurs when I build the app for distribution (Shipping configuration) and try to upload it to TestFlight.
  • Apple now requires apps to be built with iOS 18 SDK and Xcode 16, so I’ve updated my build machine accordingly.
  • Despite that, I’m still encountering packaging failures.

I’ve attached the latest log file from the build – could you please take a look and help identify what’s causing the issue?

Thank you so much for your support!

Log attached below. Let me know if anything else is needed.

Log.txt (219.8 KB)