Send OauthPrompt as a Oauth Card

Hi Lakshmi_145,

here's the example code for sending an OAuth card as an attachment and performing token validation in a new dialog with explanation, maybe you can try it for your issue:

// Step 1: Create an OAuth card using the OAuthCard class
private OAuthCard GetOAuthCard()
{
    var oauthCard = new OAuthCard
    {
        Text = "BotFramework OAuth Card",
        ConnectionName = "OAuth connection", // Replace with your connection name.
        Buttons = new List<CardAction> { new CardAction(ActionTypes.Signin, "Sign In", value: "https://example.org/signin") },
    };

    return oauthCard;
}

// Step 2: Send the OAuth card as an attachment in a waterfall step
private async Task<DialogTurnResult> PromptStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
{
    var oauthCard = GetOAuthCard();

    var message = MessageFactory.Attachment(oauthCard.ToAttachment());
    await stepContext.Context.SendActivityAsync(message, cancellationToken);

    return await stepContext.PromptAsync(nameof(ConfirmPrompt), new PromptOptions
    {
        Prompt = MessageFactory.Text("Would you like to view your token?")
    }, cancellationToken);
}

// Step 3: Define an OAuthPrompt for token validation
var oauthPrompt = new OAuthPrompt(nameof(OAuthPrompt), new OAuthPromptSettings
{
    ConnectionName = ConnectionName,
    Text = "Please Sign In",
    Title = "Sign In",
    Timeout = 300000, // User has 5 minutes to login (1000 * 60 * 5)
});

// Step 4: Create a new dialog for token validation
AddDialog(oauthPrompt);

AddDialog(new WaterfallDialog(nameof(ValidateTokenDialog), new WaterfallStep[]
{
    // Step 5: Handle the token response in the new dialog
    async (stepContext, cancellationToken) =>
    {
        return await stepContext.BeginDialogAsync(nameof(OAuthPrompt), null, cancellationToken);
    },
    async (stepContext, cancellationToken) =>
    {
        var tokenResponse = (TokenResponse)stepContext.Result;
        if (tokenResponse != null)
        {
            // Token validation was successful; use the token for further actions.
            await stepContext.Context.SendActivityAsync(MessageFactory.Text("Token validation successful."), cancellationToken);
        }
        else
        {
            await stepContext.Context.SendActivityAsync(MessageFactory.Text("Token validation failed. Please try again."), cancellationToken);
        }

        return await stepContext.EndDialogAsync(cancellationToken: cancellationToken);
    }
}));

// Set the initial child dialog to run
InitialDialogId = nameof(ValidateTokenDialog);