Xcode 26 run an very old iOS project, when run in iPhone 17 series simulator, it get XXX's architectures (Intel 64-bit) include none that iPhone 17 can execute (arm64), and when I run in iPhone device, it works correctly. The project setting is in the picture below.
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.