I have the exact same problem. When I look up my sdk version, I get 14:
¯_(ツ)_/¯: xcodebuild -sdk -version
iPhoneOS14.4.sdk - iOS 14.4 (iphoneos14.4)
SDKVersion: 14.4
Path: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS14.4.sdk
PlatformVersion: 14.4
PlatformPath: /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform
BuildID: 34AA5D88-518E-11EB-91C4-72143A615026
ProductBuildVersion: 18D46
ProductCopyright: 1983-2021 Apple Inc.
ProductName: iPhone OS
ProductVersion: 14.4
But when I submit it, I receive an email with the error:
Dear Developer,
We identified one or more issues with a recent delivery for your app. Please correct the following issues, then upload again.
ITMS-90725: SDK Version Issue - This app was built with the iOS SDK. All iOS apps submitted to the App Store must be built with the iOS 13 SDK or later, included in Xcode 11 or later. Further, starting April 26, 2021 iOS apps submitted to the App Store must be built with the iOS 14 SDK or later, included in Xcode 12 or later.
Best regards,
The App Store Team
Anyone from Apple who can help?
ole_codeshift
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