I have created a brand new web form application from Visual Studio 2013 and set the following in the web.config file:
Here is how I got it to work.
Account folder except Login.aspxIdentityConfig and Startup.Auth under the App_Start folderIdentityModels under the Models folderStartup under the root folder of the applicationPage_Load and LogIn inside the Login.aspx code fileOpenAuthProviders in the Login.aspx markupappSettings section inside the web.config file