My goal is to get an SSO token in a Teams bot. The code below is my try to get this working in the most basic way.
In response to any input, a waterfall dialog is executed which runs TeamsBotSsoPrompt. I verified all settings are correct and there is no exception.

我的目标是在团队机器人中获得SSO令牌。下面的代码是我试图让它以最基本的方式工作。响应任何输入，将执行一个瀑布对话框来运行TeamsBotSsoPrompt。我验证了所有设置都是正确的，没有例外。

The line return await ssoPrompt.BeginDialogAsync(stepContext, _dialogState, cancellationToken); executes without error.

返回的行等待ssoPrompt.BeginDialogAsync(SteContext，_DialogState，ancellationToken)；执行时没有错误。

Stepping into the code I find that TeamsBotSsoPrompt calls await SendOAuthCardToObtainTokenAsync(dialogContext.get_Context(), cancellationToken).ConfigureAwait(continueOnCapturedContext: false); and that's the last event I see. There is no output in Teams.

进入代码，我发现TeamsBotSsoPrompt调用等待SendOAuthCardToObtainTokenAsync(dialogContext.get_Context()，cancellationToken).ConfigureAwait(continueOnCapturedContext：为False)；这是我看到的最后一个事件。在团队中没有产出。

The last sign of activity in my bot is then a call to my override OnTeamsSigninVerifyStateAsync().

然后，我的bot中的最后一个活动标志是对我的覆盖OnTeamsSigninVerifyStateAsync()的调用。

The second step of the waterfall where I would get access to the token is never reached.

瀑布的第二个步骤，我将访问令牌的地方永远不会到达。

What do I have to do to get the token?

我要做什么才能拿到令牌？

using Microsoft.Bot.Builder;
using Microsoft.Bot.Builder.Teams;
using Microsoft.Bot.Schema;
using Microsoft.Bot.Builder.Dialogs;
using DataPlatformBot.SSO;
using Microsoft.TeamsFx.Bot;
using Microsoft.Extensions.Options;
using Microsoft.TeamsFx.Configuration;

namespace DataPlatformBot;

public class TeamsBot : TeamsActivityHandler
{
    readonly ILogger<TeamsBot> _logger;
    readonly SsoDialog _ssoDialog;
    readonly IStatePropertyAccessor<DialogState> _dialogState;
    readonly BotAuthenticationOptions _botAuthOptions;
    readonly BotState _conversationState;
    
    public TeamsBot(ConversationState conversationState, IOptions<BotAuthenticationOptions> botAuthOptions, SsoDialog ssoDialog, ILogger<TeamsBot> logger)
    {
        _ssoDialog = ssoDialog;
        _logger = logger;

        _conversationState = conversationState;
        _dialogState = _conversationState.CreateProperty<DialogState>("DialogState");
        _botAuthOptions = botAuthOptions.Value;
    }

    protected override async Task OnMessageActivityAsync(ITurnContext<IMessageActivity> turnContext, CancellationToken cancellationToken)
    {
        var wd = new WaterfallDialog("SsoWaterfall", new List<WaterfallStep> {
            async (stepContext, cancellationToken) => {
                var ssoSettings = new TeamsBotSsoPromptSettings(_botAuthOptions, new string[] { "User.Read" });
                var ssoPrompt = new TeamsBotSsoPrompt(nameof(TeamsBotSsoPrompt), ssoSettings);
                return await ssoPrompt.BeginDialogAsync(stepContext, _dialogState, cancellationToken);
            },
            async (stepContext, cancellationToken) => {
                var tokenResponse = (TeamsBotSsoPromptTokenResponse)stepContext.Result;
                return await stepContext.EndDialogAsync();
            }
        });

        await wd.RunAsync(turnContext, _dialogState, cancellationToken);
    }

    protected override async Task OnTeamsSigninVerifyStateAsync(ITurnContext<IInvokeActivity> turnContext, CancellationToken cancellationToken)
    {
        _logger.LogInformation("Receive invoke activity of teams sign in verify state");
    }

    
    public override async Task OnTurnAsync(ITurnContext turnContext, CancellationToken cancellationToken = default(CancellationToken))
    {
        await base.OnTurnAsync(turnContext, cancellationToken);
    }
}

Please refer to this wiki on how to implement SSO with TeamsFx SDK. You can find sample code here.

请参考此维基了解如何使用TeamsFx SDK实现单点登录。您可以在此处找到样例代码。