Conditional access policies: Mobile Application Management (MAM) and Azure Active Directory (Azure AD) Conditional Access.

Authorization methods: Microsoft's implementation of Open Authorization (OAuth).

Authentication methods: Multifactor authentication (MFA) smart card authentication client certificate-based authentication.

Modern authentication is an umbrella term for a combination of authentication and authorization methods between a client (for example, your laptop or your phone) and a server, as well as some security measures that rely on access policies that you may already be familiar with.

What else do I need to know before I begin?.

Do you meet modern authentication prerequisites?.

Check the modern authentication status of your on-premises environment.

What changes when I use modern authentication?.

This article links to related docs about prerequisites, setup/disabling modern authentication, and to some of the related client (ex. It's available for Office 365 hybrid deployments of Skype for Business server on-premises and Exchange server on-premises, and split-domain Skype for Business hybrids.

Modern Authentication is a method of identity management that offers more secure user authentication and authorization. This article applies to both Microsoft 365 Enterprise and Office 365 Enterprise. Hybrid modern authentication overview and prerequisites for using it with on-premises Skype for Business and Exchange servers In this article, you will learn about Hybrid Modern Authentication and the prerequisites for use with on-premises Skype for Business and Exchange servers.

O365 modern authentication