The unique handle that your app assigned to the user.
- iOS 10.0+
- Mac Catalyst 13.0+
- watchOS 3.2+
The value of this property is an object that uniquely identifies the user to your app. For example, you might provide a handle containing an email address, a phone number, or an account name associated with the user. Siri might show this information when asking the user to choose from among several people with similar names.