ASP.NET Core Identity 2.0 SignoutAsync is not logging out user if the user signed in with Google

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The problem is that your RedirectToAction overwrites the redirect to the Identity Server endsession URL that SignOutAsync issues.

As for SignOutAsync, what is obsolete is the Authentication portion — as of ASP.NET Core 2.0 it’s an extension directly off HttpContext itself.

(The same explanation for the same signout problem is given here by Microsoft’s HaoK.)

Edit: The solution is to send a redirect URL in an AuthenticationProperties object with the final SignOutAsync:

// in some controller/handler, notice the "bare" Task return value
public async Task LogoutAction()
{
    // SomeOtherPage is where we redirect to after signout
    await MyCustomSignOut("/SomeOtherPage");
}

// probably in some utility service
public async Task MyCustomSignOut(string redirectUri)
{
    // inject the HttpContextAccessor to get "context"
    await context.SignOutAsync("Cookies");
    var prop = new AuthenticationProperties()
    {
        RedirectUri = redirectUri
    };
    // after signout this will redirect to your provided target
    await context.SignOutAsync("oidc", prop);
}

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