I'm attempting to use DotNetOpenAuth for some web single sign on functionality.
I got the samples working for Google and Yahoo but am struggling with Facebook.
I am using the CTP (4.0.0.11165) and have followed the example in this SO question.
However, I get a runtime error on the line:
IAuthorizationState authorization = client.ProcessUserAuthorization();
The error is:
Failed to obtain access token. Authorization Server reports reason: (unknown)
Any ideas?