I find the reason of this problem, in Xcode 26, when you download the simulator, the default iOS 26 simulator's arch is arm64, so when you add the Excluded Architectures arm64, the build result get none of any arch. The solution is to download the universal simulator, first, you should delete the iOS 26 simulator, then run xcodebuild -downloadPlatform iOS -architectureVariant universal in terminal, then xcode can download the universal of iOS 26 simulator.
Topic:
Developer Tools & Services
SubTopic:
Xcode