I’m struggling to get a vibration working from my App.

I have downloaded Asad/Azam Morsecode project https://github.com/AsadAzam/MorseCode
and it works, so my device supports vibrations.

App background: I am using on-device speech recognition to identify words and phrases, I want a correct phrase to trigger a small vibration. In this way, the phone can be in a pocket and a Lavalier Mic can be used to control the app with simple vibration confirmations.

My code looks like this:

import SwiftUI
import CoreHaptics

class cInterpreter : ObservableObject
{
    var engine: CHHapticEngine!

    init()
    {
        guard CHHapticEngine.capabilitiesForHardware().supportsHaptics else { return }
        do
        {
            self.engine = try CHHapticEngine()
            try self.engine?.start()
        }
        catch
        {
            print("There was an error creating the engine: (error.localizedDescription)")
        }
    }
...
    func someFunc(saidString : String)
    {
        // check if candidate string is recognised
        ...

        // Play a confirmation buzz
        if (foundACandidate)
        {
       //     DispatchQueue.global(qos: .utility).async
       //     {
                let vibe = CHHapticEvent(eventType: .hapticContinuous, parameters: [.init(parameterID: .hapticIntensity, value: 0.81), .init(parameterID: .hapticSharpness, value: 0.8)], relativeTime: 0, duration: 0.12)
                do
                {
                    let pattern = try CHHapticPattern(events: [vibe], parameters: [])
                    let player = try self.engine?.makePlayer(with: pattern)
                    print("Playing...")
                    try player?.start(atTime: 0)
                } 
                catch 
                {
                    print("Failed to play pattern: (error.localizedDescription).")
                }
       //     }
            
            print("Buzz")
        }

I get “Playing” and “Buzz” in the console, but no haptic on the phone. Any ideas what I’m doing wrong? Cheers.