Message: "No Passcode Detected" in Norton 360 for iOS

A passcode is required to lock and secure your device from unauthorized access. A device without a passcode or Face ID or Touch ID may allow attackers to access your information and take over your device. Make sure that you set a passcode or Face ID or Touch ID on your iOS device.

To know more, read Use a passcode with your iPhone, iPad, or iPod touch.