dont work

[tonyleone1964]

    public string StartSendLocation2Hololens()
    {
        string retval = "inizio";

        wifiApManager = new WifiApManager(MainActivity.MainActivityInstance);
                    if( wifiApManager.GetWifiApState() == Enums.WIFI_AP_STATE.WIFI_AP_STATE_ENABLED )
        {
            if (wifiApManager.IsWifiApEnabled())
            {
                List<ClientScanResult> x = (List<ClientScanResult>)wifiApManager.GetClientListAsync(true, 300).Result;

                if ( x.Count > 0 )
                {
                    retval = x[0].IPAddr;
                }
                else
                {
                    retval = "non ci sono devices collegati.";
                }

            }
            else
            {
                retval = "devi attivare hotspot !!";
            }
        }
        else
        {
            if(wifiApManager.GetWifiApState() == Enums.WIFI_AP_STATE.WIFI_AP_STATE_DISABLED )
                retval = "wifi disabled";
            else if (wifiApManager.GetWifiApState() == Enums.WIFI_AP_STATE.WIFI_AP_STATE_DISABLING)
                retval = "wifi disabling";
            else if (wifiApManager.GetWifiApState() == Enums.WIFI_AP_STATE.WIFI_AP_STATE_ENABLING)
                retval = "wifi enabling";
            else if (wifiApManager.GetWifiApState() == Enums.WIFI_AP_STATE.WIFI_AP_STATE_FAILED)
                retval = "wifi failed";
        }

        return retval;
    }

i cannot read any connected devices, wheres is the problem? android 10, xamarin.forms app, vs2019