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c# - How do I send chat transcript? SendConversationHistoryAsync() not working

There is a sample for Conversation History: https://github.com/Microsoft/BotBuilder-Samples/tree/master/samples/csharp_dotnetcore/22.conversation-history

Actually sending the transcript doesn't work in my attempts to run it. Specifically this line:

await connectorClient.Conversations.SendConversationHistoryAsync(activity.Conversation.Id, transcript, cancellationToken: cancellationToken);

I get the following exception:

ConversationHistory> fail: Microsoft.BotBuilderSamples.ConversationHistoryBot[0] ConversationHistory> Exception caught : System.Threading.Tasks.TaskCanceledException: The operation was canceled. ---> System.IO.IOException: Unable to read data from the transport connection: The I/O operation has been aborted because of either a thread exit or an application request. ---> System.Net.Sockets.SocketException: The I/O operation has been aborted because of either a thread exit or an application request ConversationHistory> --- End of inner exception stack trace --- ConversationHistory> at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.ThrowException(SocketError error) ConversationHistory> at System.Net.Sockets.Socket.AwaitableSocketAsyncEventArgs.GetResult(Int16 token) ConversationHistory> at System.Net.Http.HttpConnection.FillAsync() ConversationHistory>
at System.Net.Http.HttpConnection.ReadNextResponseHeaderLineAsync(Boolean foldedHeadersAllowed) ConversationHistory> at System.Net.Http.HttpConnection.SendAsyncCore(HttpRequestMessage request, CancellationToken cancellationToken) ConversationHistory>
--- End of inner exception stack trace --- ConversationHistory> at Microsoft.BotBuilderSamples.ConversationHistoryBot.OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken) in C:UsersOyensource eposBotBuilder-Samplessamplescsharp_dotnetcore22.conversation-historyConversationHistoryBot.cs:line 99 ConversationHistory> at Microsoft.Bot.Builder.TranscriptLoggerMiddleware.OnTurnAsync(ITurnContext turnContext, NextDelegate nextTurn, CancellationToken cancellationToken) in D:a1slibrariesMicrosoft.Bot.BuilderTranscriptLoggerMiddleware.cs:line 105 ConversationHistory> at Microsoft.Bot.Builder.MiddlewareSet.ReceiveActivityWithStatusAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken) in D:a1slibrariesMicrosoft.Bot.BuilderMiddlewareSet.cs:line 55 ConversationHistory> at Microsoft.Bot.Builder.BotAdapter.RunPipelineAsync(ITurnContext turnContext, BotCallbackHandler callback, CancellationToken cancellationToken) in D:a1slibrariesMicrosoft.Bot.BuilderBotAdapter.cs:line 167

I can confirm that the transcript files are saved in my blob storage, and I can iterate through the activities retrieved from the blob.

(1) What am I missing to get SendConversationHistoryAsync() to work?

(2) What does the actual transcript look like when sent? (Is it worth it to just iterate through my activities and handle each activity type and make my own conversation history message?)

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The ConversationHistory sample functions as expected. But, when using the WebChat or Emulator channels, the Activity.Ids must be updated. Otherwise, the WebChat control will filter them out if already present:

bool updateActivities = new[] { Channels.Webchat, Channels.Emulator, Channels.Directline, }
                             .Contains(activity.ChannelId);
var incrementId = 0;
//get current id to ensure we do not overlap
if (updateActivities && activity.Id.Contains("|"))
{
     int.TryParse(activity.Id.Split('|')[1], out incrementId);
}

/* get activities */

foreach (var a in activities)
{
  incrementId++;
  a.Id = string.Concat(activity.Conversation.Id, "|", incrementId.ToString().PadLeft(7, '0'));
  a.Timestamp = DateTimeOffset.UtcNow;
  a.ChannelData = string.Empty; // WebChat uses ChannelData for id comparisons, so clear it
}

var transcript = new Transcript(activities);

await connectorClient.Conversations.SendConversationHistoryAsync(activity.Conversation.Id, 
                                transcript, cancellationToken: cancellationToken);

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