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Like the App Installed event, it is an after event, but is essentially synchronous and it is a best practice to catch errors and notify Share Point to roll back the update.Some examples of what a handler for this event can do: .The URL of the RER service is registered for the events it handles.There are two ways to register a handler: The field update events are about changing the properties of a field (column) on a list, such as whether it is sortable, not about changing the data in the field.

Note When you install an add-in with Tenant scope, it is installed to the add-in catalog site collection and the App Installed event runs then and only then.Share Point cannot delete these things, or move them to the recycle bin, because it doesn't know about them, at least not as components of the add-in.It is usually a good practice to remove these things.The App Uninstalling event is synchronous and you can use it to cancel the uninstallation, which would leave the add-in in the second stage recycle bin.The main purpose of a handler for this event is to delete or recycle things that were deployed with a App Installed (or an App Updated) handler.