Sign in with Google+ API - GetExternalLoginInfoAsync return null

When I try to sign in with Google authentication, I encounter an issue that I can't receive information by using signInManager.GetExternalLoginInfoAsync(). This is because Google plus is shutting down. Here I give the overall codes and sources for google authentication. I used ASP.NET core 2.2.

The process of create a Google API console project is :

Create Google oauth credentials client Id and secret.
Set up API and configure

1. Create Google oauth credentials client Id and secret.

Learn to create client Id and secret by this link: https://docs.microsoft.com/en-US/aspnet/core/security/authentication/social/google-logins?view=aspnetcore-3.1

Notice: enable SSL, e.g., use https://localhost:44306/signin-google for Authorised redirect URIs in oauth client IDs in Credentials.

2. Set up API and configure

In startup.cs, add configure service :

services.AddAuthentication().AddGoogle(option =>
            {
                option.ClientId = "597035172561-c50s2qu28fj78tl1lmivb6v8tpsr9qta.apps.googleusercontent.com";
                option.ClientSecret = "vGIslMG3NOGqcLKdc8uwmu-n";
                //option.UserInformationEndpoint = "https://www.googleapis.com/oauth2/v1/certs";
                option.UserInformationEndpoint = "https://www.googleapis.com/oauth2/v2/userinfo";
                option.ClaimActions.Clear();
                option.ClaimActions.MapJsonKey(ClaimTypes.NameIdentifier, "id");
                option.ClaimActions.MapJsonKey(ClaimTypes.Name, "name");
                option.ClaimActions.MapJsonKey(ClaimTypes.GivenName, "given_name");
                option.ClaimActions.MapJsonKey(ClaimTypes.Surname, "family_name");
                option.ClaimActions.MapJsonKey("urn:google:profile", "link");
                option.ClaimActions.MapJsonKey(ClaimTypes.Email, "email");
            });

Notice: just input clientID and ClientSecret will through an exception "HttpRequestException: An error occurred when retrieving Google user information (Forbidden). Please check if the authentication information is correct and the corresponding Google+ API is enabled." This is because Google plus is shutting down. I tried to add an UserInformationEndpoint but found that I can't receive information by using signInManager.GetExternalLoginInfoAsync(). Codes in the controller are:

 [HttpPost]
 [AllowAnonymous]
 public IActionResult ExternalLogin(string provider, string returnUrl)
{
    var redirectUrl = Url.Action("ExternalLoginCallback", "account",
                new { ReturnUrl = returnUrl });
    var properties = signInManager
        .ConfigureExternalAuthenticationProperties(provider,redirectUrl);
    return new ChallengeResult(provider, properties);
}

 [AllowAnonymous]
public async Task<IActionResult> ExternalLoginCallback
            (string returnUrl = null,string remoteError = null)
{
     returnUrl = returnUrl ?? Url.Content("~/");
     var info = await signInManager.GetExternalLoginInfoAsync();
    // info should contain user information after successful signed in google.
     var signInResult = await signInManager.
         ExternalLoginSignInAsync(info.LoginProvider,
                info.ProviderKey, isPersistent: false, bypassTwoFactor: true);
}

Official announcement

https://github.com/aspnet/AspNetCore/issues/6486

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