Web Reference: While trying to build version 3.4.5 for Mac we have started to get this error: Command CodeSign failed with a nonzero exit code Have tried everything people have said in this and other forums: Mar 27, 2026 · After updating to Xcode 26.4, one of my small projects (a multi-platform iOS/macOS app built in SwiftUI and using metal) has started throwing an error when I try and build the Mac app. The error is "Command CodeSign failed with a nonzero exit code". EDIT: I got a fix! Here it says that if you delete your developer signing certificate in key access (and regenerate it in signing & capabilities) you'll be good.
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