I'm getting error Upgrade Required while integrating twilio whatsapp in c#

Question

This is the error I am getting while trying to send the message.

An unhandled exception of type 'Twilio.Exceptions.ApiException' occurred in Twilio.dll
Additional information: Upgrade Required

My code is:

const string accountSid = "Value";
const string authToken = "Value";
TwilioClient.Init(accountSid, authToken);
var to = new PhoneNumber("+whatsapp:+13233633791");
var message = MessageResource.Create(
    to,
    from: new PhoneNumber("+whatsapp:+12037179461"),
    body: "Hi Joe! Your order D45987AB will arrive on 8/12/2018 before 8 pm.");
    Console.WriteLine(message.Sid);

Answer 1

Per their docs, Twilio APIs now requires TLS v1.2 and string cipher suites.

Inside your method, before MessageResource.Create() is invoked, add

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
                                                | SecurityProtocolType.Tls11
                                                | SecurityProtocolType.Tls12
                                                | SecurityProtocolType.Ssl3;