show welcome message in Microsoft teams using Microsoft bot framework - botframework

Question

I have used below code for showing a welcome message to user.
private Activity HandleSystemMessage(Activity message)
{
if (message.Type == ActivityTypes.DeleteUserData)
{
// Implement user deletion here
// If we handle user deletion, return a real message
}
else if (message.Type == ActivityTypes.ConversationUpdate)
{
string replyMessage = string.Empty;
replyMessage = Responses.Greeting;
return message.CreateReply(replyMessage);
}
else if (message.Type == ActivityTypes.ContactRelationUpdate)
{
// Handle add/remove from contact lists
// Activity.From + Activity.Action represent what happened
}
else if (message.Type == ActivityTypes.Typing)
{
// Handle knowing tha the user is typing
}
else if (message.Type == ActivityTypes.Ping)
{
}
return null;
}
Below method is used to call HandleSystemMessage, if activity type is not message.
public async Task<HttpResponseMessage> Post([FromBody]Activity activity)
{
string reply = "";
ConnectorClient connector = new ConnectorClient(new Uri(activity.ServiceUrl));
if (activity.Type == ActivityTypes.Message)
{
stLuis = await LuisHelper.ParseUserInput(activity.Text);
string userResponse = activity.Text.ToLower();
switch (stLuis.topScoringIntent.intent)
{
case "Greetings":
reply = Responses.Greeting;
break;
case "None":
reply = Responses.None;
break;
default:
break;
}
}
if (reply != "")
await connector.Conversations.ReplyToActivityAsync(activity.CreateReply(reply));
}
else
{
var reply1 = HandleSystemMessage(activity);
if (reply1 != null)
await connector.Conversations.ReplyToActivityAsync(reply1);
}
var response = Request.CreateResponse(HttpStatusCode.OK);
return response;
}
This code works with Skype. But when I add same bot in Microsoft teams, it doesn't show a welcome message.

Answer 1

By now (2016-12-30) MSFT Teams does not send any message at all when you add a bot to "contact list". This is a known limitation and to be addressed in the nearest future, as MSFT guys say.
In the meantime to get a ConversationUpdate message to the bot, the user will have to first initiate a conversation with the bot.
As a workaround you can handle special text sent from user, like "start", or just the very first incoming message, if your bot is stateful enough.