IntentHandler Not Being Called

I want to use Siri to perform a repetitive task in my app that inputs variable parameters, thus accelerating the input of that data.

I have implemented a couple custom intents for background execution with the use of an intentDefinition file and implemented an IntentsExtension and associated plist to enable those custom intents. I can successfully donate an interaction that iOS matches with the supported suggestions in the intentsDefinition file that causes a Siri Suggestion to be displayed in Siri Search (or on the lock screen when enabled):

    CreatePartsListIntent* createPartsListIntent = [[CreatePartsListIntent alloc] init];

    createPartsListIntent.projectName = intentData.projectName;

    createPartsListIntent.quantity = intentData.quantity;

   INInteraction* interaction = [[INInteraction alloc] initWithIntent:createPartsListIntent response:nil];

    [interaction donateInteractionWithCompletion:^(NSError * _Nullable error) {
        if(!error) {
            NSLog(@"CreatePartsList donation success");
        }else {
            NSLog(@"CreatePartsList donation fail %@",error.localizedDescription);
        }
    }];

I can then tap on this suggestion and it takes me to my appDelegate to process the interaction within the app

- (id)application:(UIApplication *)application handlerForIntent:(INIntent *)intent {
    // This method is called when I tap on the Siri suggestion
}

But I want to process the interaction in the background using voice commands. When I speak the the command of the interaction I donated, the IntentHandler is never called. I cannot figure out what I need to do to get the IntentHandler to be called. According to the WWDC18 Intro to Siri Shortcuts, I should be able to invoke a dialog with Siri, which is my goal.

Am I off track. Why isn't the IntentHandler being called? What should trigger it to be called?