It looks like you are trying to use the AuthenticationBuilder.Google method to configure Google authentication in your ASP.NET Core application, but you are getting an error saying that AuthenticationBuilder does not contain a definition for Google.

This error can occur if you are missing the necessary NuGet packages for Google authentication. To fix this issue, you will need to install the following NuGet packages:

  • Microsoft.AspNetCore.Authentication.Google
  • Microsoft.AspNetCore.Authentication.OpenIdConnect

Once you have installed these packages, you should be able to use the AuthenticationBuilder.Google method to configure Google authentication in your ASP.NET Core application.

Here’s an example of how you can use the AuthenticationBuilder.Google method to configure Google authentication:

Copy codeservices.AddAuthentication().AddGoogle(googleOptions =>
{
    googleOptions.ClientId = "YOUR_CLIENT_ID";
    googleOptions.ClientSecret = "YOUR_CLIENT_SECRET";
});

Make sure to replace YOUR_CLIENT_ID and YOUR_CLIENT_SECRET with the actual client ID and client secret for your application, which you can obtain from the Google Cloud Console.

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