Google OAuth on MVC5 ExternalLoginCallback?error=access_denied

I had the same problem using the latest ASP.Net MVC template with "Individual Accounts" selected.

The solution was to enable the Google+ API for my project in the Google Developer console.

I found my answer here (scroll down to "Changes to Google OAuth 2.0...").

The same error happened to me for Facebook provider.

Turns out the solution was as simple as updating the nuget package to 3.1.

It turns out that Facebook did a "force upgrade" of their graph API from version 2.2 to 2.3 on 27th March 2017

For the record I'm using the following:

• http://localhost:58364 in iisexpress with NO https

In Facebook I have the following settings configured for a test app:

In addition if you're using a sample template the error parameter returned isn't being consumed which can be misleading. You should add string error to ExternalLoginCallback

    [AllowAnonymous]
    public async Task<ActionResult> ExternalLoginCallback(string returnUrl, string error)
    {
        if (error != null)
        {
            return View("Error");
        }