Issue Summary

Serialization of MessageResource with Newtonsoft.json fails when in place of 'from' parameter , 'messagingserviceid' is provided

Code Snippet

 private async void CreateMessageResourceAsync(string serviceId, string recipient, string body)
MessageResource  message = await MessageResource.CreateAsync
            (
                body: body,
                messagingServiceSid: serviceId,
                to: new PhoneNumber(recipient)
            );
string str = JsonConvert.SerializeObject(message)
}

Exception/Log

System.Private.CoreLib: Exception while executing function: SendSmsAsync. Newtonsoft.Json: Value cannot be null. (Parameter 'o').

Technical details:

• twilio-csharp version: 5.46.2
• csharp version: .net core 3.1
• newtonsoft version: 12.0.3