Cannot request for location permission on Apple Watch

Updated:

I created a small Xcode project https://github.com/gie3d/getting-location-permission-problem. Incase anyone would like to try on this problem.

I'm developing an app for Apple Watch. The app needs to access user location. The problem is when I request a location permission, the request permission sheet doesn't show. Even though the authorizationStatus is .notDetermined

My code

import Foundation
import CoreLocation

class WorkoutManager: NSObject, ObservableObject {
  let locationManager = CLLocationManager()

  func requestLocationAuthorization() {
        print("prepare to request location permission")
        locationManager.requestWhenInUseAuthorization()
        if CLLocationManager.locationServicesEnabled() {
            
            print("it is enabled")
            switch locationManager.authorizationStatus {
                case .notDetermined:
                    print("not determined")
                case .restricted:
                    print("restricted")
                case .denied:
                    print("denied")
                case .authorizedAlways, .authorizedWhenInUse:
                    print("Access")
            }
        } else {
            print("it is not enabled")
        }
    }
}

I passed this WorkoutManager into my SwiftUI View using an environment object

import SwiftUI

@main
struct RunnerApp: App {
    @StateObject var workoutManager = WorkoutManager()
    @SceneBuilder var body: some Scene {
        WindowGroup {
            NavigationView {
                ContentView()
            }
            .environmentObject(workoutManager)
        }
    }
}

And this is my ContentView, I called requestLocationAuthorization() during onAppear()

import SwiftUI

struct ContentView: View {
    
    @EnvironmentObject var workoutManager: WorkoutManager
    var body: some View {
        ScrollView {
            Text("Hello World")
        }
        .navigationBarTitleDisplayMode(.inline)
        .navigationTitle("Test")
        .onAppear() {
            print("on appear - content view")
            workoutManager.requestLocationAuthorization()
        }
    }
}

And the output log shows as below...

on appear - content view
prepare to request location permission
it is enabled
not determined

I wonder if the location permission is still not determined, why requestWhenInUseAuthorization() did nothing?