Identity Server is an authentication server that implements OpenID Connect (OIDC) and OAuth 2.0 standards and provides a common way to authenticate requests to all of our applications.
This also allows Single Sign-On (SSO) for multiple applications and application types using a local or social media acount.
Two factor authentication is also available via Microsoft Authenticator or Google Authenticator apps and full setup instructions and links can be found in your account.
IdentityServer is an open-source project developed by Dominick Baier & Brock Allen which is OpenID Connect certified.
You can view the project on GitHub as well as the documentation and other information on their website.
Other certified OpenID Connect products can be found here.