ios – Apple mapkit route function dose not works in China

I’m developing an iOS app using MapKit to calculate travel times between two coordinates.
Everything works perfectly when I test with coordinates in the US, Japan, or Hong Kong if my network is outside mainland China.

However, when my device (or simulator) is connected to a mainland China network and always fails with: “Directions Not Available“

Some test result:
Hong Kong → Hong Kong: ✅ works

Hong Kong → Shanghai: ✅ works

Shanghai → Hong Kong: ✅ works

Japan (Tokyo → Tokyo): ❌ fail

US (New York → New York): ❌ fail

struct TravelTimeCalculator {
    static func calculateTravelTime(
        from: CLLocationCoordinate2D,
        to: CLLocationCoordinate2D
    ) async throws -> TimeInterval {
        let sourcePlacemark = MKPlacemark(coordinate: from)
        let destPlacemark = MKPlacemark(coordinate: to)

        let request = MKDirections.Request()
        request.source = MKMapItem(placemark: sourcePlacemark)
        request.destination = MKMapItem(placemark: destPlacemark)
        request.transportType = .automobile

        let directions = MKDirections(request: request)
        let response = try await directions.calculate()
        guard let route = response.routes.first else {
            throw NSError(domain: "No route found", code: -1)
        }
        return route.expectedTravelTime
    }
}

@MainActor
struct TravelTimeView: View {
    @State private var travelTime: String = "Calculating..."

    var body: some View {
        VStack {
            Text(travelTime)
                .font(.title2)
        }
        .task {
            do {
                // Example: Tokyo Station → Shibuya Station
                let from = CLLocationCoordinate2D(latitude: 35.6811441, longitude: 139.7644865)
                let to   = CLLocationCoordinate2D(latitude: 35.6580382, longitude: 139.6990609)
                
                let seconds = try await TravelTimeCalculator.calculateTravelTime(from: from, to: to)
                let minutes = Int(seconds / 60)
                travelTime = "🚗 Estimated \(minutes) min"
            } catch {
                travelTime = "❌ Route not available"
                print("Route error: \(error.localizedDescription)")
            }
        }
    }
}

Test all kind of source / dest combination…