I am trying to call an api using .net maui but i am getting one or more errors occurred. (Connection failure) error and the api not hitting at all.
here is my code.

 public async Task<string> SaveSmtpAsyc(SmtpDTO obj)
 {   
string res = "";
try
{
    
    using (HttpClient httpClient = new HttpClient())
    {
        var uri = new Uri(Settings.BASEADDRESS);
        httpClient.BaseAddress = new Uri(  Settings.BASEADDRESS);
        
        //httpClient.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        httpClient.Timeout = TimeSpan.FromMinutes(5);
        using (HttpRequestMessage request = new HttpRequestMessage())
        {

            var parms = new Dictionary<string, string>()
            {

                {"userId", obj.userId.ToString() },
                {"port", obj.port.ToString() },
                {"host", obj.host},
                {"email", obj.email },
                {"password", obj.password },
                {"incoming", obj.incoming },
                {"outgoing", obj.outGoing },
                {"ssl", obj.ssl.ToString() }
            };
            var irequest = new StringContent(
                JsonConvert.SerializeObject(parms),
                Encoding.UTF8,
                "application/json");
            HttpResponseMessage response;
            response = httpClient.PostAsync(
                               new Uri(uri, "api/smtp"),
                               irequest).GetAwaiter().GetResult();


            if (response.IsSuccessStatusCode)

            {
                res = "true";
            }

        }
    }
}
catch (AggregateException ex)
{
    foreach (var errInner in ex.InnerExceptions)
    {
        string s = errInner.Message; //this will call ToString() on the inner execption and get you message, stacktrace and you could perhaps drill down further into the inner exception of it if necessary 
    }

    res = ex.GetBaseException().Message;
}

return res;
}

can someone help me with this error, i used mysql db for apis. i am always getting the following error.

Getting one or more errors occurred. (Connection failure)