From Xojo Documentation

Read-Only Property (As String )
StringValue = aLocationNotification.LocationIdentifier

New in 2020r2

Supported for all project types and targets.

A value that can be used by the app to identify the location.


This value is something your assign when the notification is sent using MobileNotifications.Send to allow it to identify the location when examining an incoming notification. For example, if your app was going to send out a notification when the user arrived at their home, you might use "home" as the location identifier.