ASP.NET Core - Two Factor Authentication Using Google Authenticator
How to set up two factor authentication in ASP.NET Core using Google Authenticator | by Ankit Sharma | We've moved to freeCodeCamp.org/news | Medium
Asp.net Two Factor Auth With Google's Authenticator App Part 2
GitHub - BrandonPotter/GoogleAuthenticator: Simple, easy to use server-side two-factor authentication library for .NET that works with Google Authenticator and Authy.
How to set up two factor authentication in ASP.NET Core using Google Authenticator
Using Google Authenticator with ASP.NET Identity | Jerrie Pelser's Blog