ITMS-90111 "Unsupported SDK or Xcode version" on Xcode 26.6 (17F113) — current release, not beta
Getting ITMS-90111 rejections on App Store submission (not TestFlight — TestFlight accepts the build fine) using Xcode 26.6 (17F113), which is the current non-beta release as of writing.
Details:
Two separate builds rejected with this error, both archived and exported via xcodebuild from Xcode 26.6 (17F113) SDK: iphoneos26.5, DTSDKBuild/DTPlatformBuild 23F81a Rejection text says the submission must use the latest Xcode and SDK Release Candidates Ruled out local toolchain issues: full DerivedData wipe + clean CocoaPods reinstall before the second build, and the archive's Info.plist plus every embedded framework (Capacitor, Cordova, etc.) show identical, consistent Xcode/SDK stamps No newer non-beta Xcode exists to upgrade to — 27.0 is beta-only
Has anyone else hit ITMS-90111 on 17F113 specifically? I used Claude (Anthropic's AI assistant) to help build and diagnose this — walked through the archive/export process end-to-end via command line and compared archive metadata across builds, but couldn't find a local fix, which is why I'm posting here. Wondering if this is an Apple-side validation issue similar to the one reported with Xcode 10.1 back in 2018 (also non-beta, also ITMS-90111).
Any confirmation on exactly which SDK/Xcode combination App Review currently expects would help.