I followed the SoupChef Xamarin port to implement Siri Shortcuts in my app. My app is based on Uno Platform.
When I invoke my Siri Shortcut, the Device Console logs the following message:
assistantd (IntentsCore) Subsystem: com.apple.siri Category: Intents ~[INCAppProxy launchAppInBackground:completionHandler:] Couldn't find current user activity in transaction <private>, creating a fallback one now...
After which Siri launches my app, but my IntentHandler doesn't get called.
I don't have an AppDelegate because of Uno, so I dont do any UserActivity registration or handling.