How do I stop single sign on (SSO) option using Web Authentication Broker

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C#

Windows

Win8

Hi All,

I am developing a Windows Store App which requires user to authenticate using Yammer credentials. I have written the following code to achieve the functionality

var client_id = <<My Client ID >>;
            var client_secret = <<My Client Secret>>;
           
            string redirectURI = WebAuthenticationBroker.GetCurrentApplicationCallbackUri().ToString();
            string loginURI = "https://www.yammer.com/dialog/oauth?client_id=" + client_id + "&redirect_uri=" + redirectURI;
            
            var result = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None, new Uri(loginURI), new Uri(redirectURI));
            if (result.ResponseStatus == WebAuthenticationStatus.Success)
            {
                var response = result.ResponseData;
                string[] keyValPairs = response.Split('=');
                HttpClient client = new HttpClient();
                string url = "https://www.yammer.com/oauth2/access_token.json?client_id=" + client_id + "&client_secret=" + client_secret + "&code=" + keyValPairs[1];
                HttpResponseMessage JSONresponse = await client.GetAsync(url);
                string content = await JSONresponse.Content.ReadAsStringAsync();
}

When I ran the app for the first time it asked me for my credentials and I was able to login.

Now when I run my app , it takes my previous entered credentials and logs in automatically. I am sure that I did not check "Keep Me signed In" option.

I want the app to ask for credentials every time I run it.

Please help and thanks in advance.