I do have old Xcode 26 installed still. xcode-select -p /Applications/Xcode-beta.app/Contents/Developer xcrun simctl list runtimes == Runtimes == iOS 18.5 (18.5 - 22F77) - com.apple.CoreSimulator.SimRuntime.iOS-18-5 iOS 26.2 (26.2 - 23C54) - com.apple.CoreSimulator.SimRuntime.iOS-26-2 iOS 26.4 (26.4.1 - 23E254a) - com.apple.CoreSimulator.SimRuntime.iOS-26-4 watchOS 11.5 (11.5 - 22T572) - com.apple.CoreSimulator.SimRuntime.watchOS-11-5 watchOS 26.0 (26.0 - 23R351) - com.apple.CoreSimulator.SimRuntime.watchOS-26-0 I removed and redownloaded iOS 27 platform again and still no luck.