NWConnection EACCES on Mojave

The following NWConnection code sending a UDP broadcast message works perfectly on Catalina, but fails with EACESS on Mojave. I am guessing that the socket broadcast flag is set on Catalina but not Mojave, is there a workaround to get this function on 10.14, or is broadcast in the Network framework broken in Mojave ?

import Network
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

var broadcastConnection: NWConnection?

func broadcast() {

    let hostUDP: NWEndpoint.Host = "255.255.255.255"
    let portUDP: NWEndpoint.Port = 9000

    broadcastConnection = NWConnection(host: hostUDP, port: portUDP, using: .udp)
    broadcastConnection?.stateUpdateHandler = { (newState) in
        switch newState {
        case .ready:
            let packet = "Hello".data(using: .utf8)!
            print("SEND ")
            broadcastConnection?.send(content: packet, completion: NWConnection.SendCompletion.contentProcessed(({ (NWError) in
                print("Sent: \(NWError?.debugDescription ?? "Success")")
                broadcastConnection?.cancel()
                broadcastConnection = nil
                PlaygroundPage.current.finishExecution()

            })))
        default:
            break
        }
    }
    broadcastConnection?.start(queue: .global())
}

broadcast()

Result on Catalina:

SEND 
Sent: Success

Result on Mojave:

SEND 
Sent: POSIXErrorCode: Permission denied

Thanks for any insight

Cheers

Guy