Authenticating WAAD users via ACS

Hi All,

I am new to ACS/WAAD/AAL etc. having only discover this in the last month or so.

I am trying to build a login page that allows the user to select and IDP, in my demo I am using Google and WAAD tenant. Then the user can enter a login and a password and submit these for authentication. I have seen a sample that looks similar to what I think I need to do here "http://code.msdn.microsoft.com/AAL-Native-Application-to-f8971f47#content".

I have constructed a simple webform and configured ACS with a relying party that includes Google and my WAAD tenent as IDPs. When I test my application i get two different errors and I do not understand why.

The first error is "Data at the root level is invalid. Line 1, position 1." when I try to authenticate via WAAD Tenant.

The second error is "Data at the root level is invalid. Line 1, position 1." when I try to authenticate against Google.

The authentication code is below:

        _authContext = new AuthenticationContext("https://littledeadbunny.accesscontrol.windows.net");

        string enteredEmailDomain = result.Username.Substring(result.Username.IndexOf('@') + 1);

        IList<IdentityProviderDescriptor> idpdList = _authContext.GetProviders("http://littledeadbunny.com/NonInteractive");
        foreach (IdentityProviderDescriptor idpd in idpdList)
        {
            if (String.Compare(result.IDP, idpd.Name, StringComparison.OrdinalIgnoreCase) == 0)
            {
                Credential credential;
                credential = new UsernamePasswordCredential(enteredEmailDomain, result.Username, result.Password);

                _assertionCredential = _authContext.AcquireToken("http://littledeadbunny.com/NonInteractive", idpd, credential);
                args.Result = result;
                return;
            }
        }

Any thoughts? is there something I have missed in ACS?

I have been looking for a solution for a number of days and would really appreciate some help.

Thanks.