I am trying to send an adaptive card which has 2 options for user to select. When user submit the response from adaptive card I am receiving :
Newtonsoft.Jso
Hit this issue today. This looks like a known issue and there is a workaround available on GitHub
Attachment attachment = new Attachment()
{
ContentType = AdaptiveCard.ContentType,
Content = JsonConvert.DeserializeObject(JsonConvert.SerializeObject(AdpCard)),
};
https://github.com/Microsoft/AdaptiveCards/issues/2148#issuecomment-462708622