Does it supports any other CarPlay category ex: Navigation etc?

Yeah, App groups are defined in both target.

Main app bundle identifier: in.xxx.app Intent extension identifier: in.xxx.app.MuteIntent App group: group.in.xxxx.shared I have save value A in Main App target and B in Intent extension target against the same key and re-run the app. Both target have its own value which I saved previously. It means UserDefaults in not shared between targets. Also tested same behaviour with Message extension where UserDefaults sharing working fine. xcode: 16.2 iOS simulator: iphone 16 pro 18.1 Is it limitation with Intent extension (Siri)?

Thanks for your support. I've resolved the issue. The problem was caused by conflicting entitlements. When the App Group capability was added, a new entitlements file was generated. To fix this, I merged the App Group information into the existing entitlements file, and the problem is now resolved.