Domain=kCLErrorDomain Code=8 when fetching location through zipcode

I'm trying to fetch the the latitude and longitude based on the input parameters postal/city and country code. Below is my code, this works fine if enter City and country name but shows error if I enter zipcode and country code. Below is the code. (Note: Location services and app permissions are enabled)

func getLocationFrom(postalCityCode: String, countryCode: String) -> CLLocation? {
        let geocoder = CLGeocoder()
        var location: CLLocation?
        let address = CNMutablePostalAddress()
        address.postalCode = postalCityCode
        address.country = countryCode
        geocoder.geocodePostalAddress(address, preferredLocale: Locale.current) { (placemarks, error) in
            guard error == nil else {
                print("Error: \(error!)")
                return
            }
            guard let placemark = placemarks?.first else {
                print("Error: placemark is nil")
                return
            }
            guard let coordinate = placemark.location?.coordinate else {
                print("Error: coordinate is nil")
                return
            }
            location = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
            print("Found location = \(location)")
        }
        return location
    }

Working input: Shanghai, CN

Failing input: 200040, CN

Edit

Attached updated code as suggested in the answer but still experiencing same issue

Currently, you are using return location before it is set, since geocoder.geocodePostalAddress(...) is an asynchronous function.

That means you need to use a completion handler (for example) to return the location, when it has the results, something like this:

func getLocationFrom(postalCityCode: String, countryCode: String, completion: @escaping ( CLLocation?) -> Void) {
    
    let geocoder = CLGeocoder()
    var location: CLLocation?
    let address = CNMutablePostalAddress()
    address.postalCode = postalCityCode
    address.country = countryCode
    geocoder.geocodePostalAddress(address, preferredLocale: Locale.current) { (placemarks, error) in
        guard error == nil else {
            print("Error: \(error!)")
            return completion(nil)
        }
        guard let placemark = placemarks?.first else {
            print("Error: placemark is nil")
            return completion(nil)
        }
        guard let coordinate = placemark.location?.coordinate else {
            print("Error: coordinate is nil")
            return completion(nil)
        }
        location = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
        print("\n--> Found location = \(location) \n")
        completion(location)   // <-- here
    }
}
    

Use it like this:

 getLocationFrom(postalCityCode: "200040", countryCode: "CN") { location in
     print("\n---> location: \(location) \n")
 }
 
 

EDIT-1

for testing and isolating the issue, try this code in a new SwiftUI project:

struct ContentView: View {
    @State var cityLocation = CLLocation()

    var body: some View {
        Text(cityLocation.description)
            .onAppear {
                getLocationFrom(postalCityCode: "200040", countryCode: "CN") { location in
                    print("\n---> location: \(location) \n")
                    if let theLocation = location {
                        cityLocation = theLocation
                    }                    
                }
            }
    }
    
    func getLocationFrom(postalCityCode: String, countryCode: String, completion: @escaping ( CLLocation?) -> Void) {
        
        let geocoder = CLGeocoder()
        var location: CLLocation?
        let address = CNMutablePostalAddress()
        address.postalCode = postalCityCode
        address.country = countryCode
        geocoder.geocodePostalAddress(address, preferredLocale: Locale.current) { (placemarks, error) in
            guard error == nil else {
                print("Error: \(error!)")
                return completion(nil)
            }
            guard let placemark = placemarks?.first else {
                print("Error: placemark is nil")
                return completion(nil)
            }
            guard let coordinate = placemark.location?.coordinate else {
                print("Error: coordinate is nil")
                return completion(nil)
            }
            location = CLLocation(latitude: coordinate.latitude, longitude: coordinate.longitude)
            print("\n--> Found location = \(location) \n")
            completion(location)
        }
    }
}