Security defaults and multi-factor authentication

Microsoft 365 Business Premium was designed to help protect your company's user accounts with preconfigured security settings. These settings include enabling multi-factor authentication (MFA) for all your admins and user accounts. For most organizations, security defaults offer a good level of sign-in security. For organizations who must meet more stringent requirements, Conditional Access can be used.

This article provides information about:


You can use either security defaults or Conditional Access policies, but you can't use both at the same time.

Security defaults

Security defaults were designed to help protect your company's user accounts from the start. When turned on, security defaults provide secure default settings that help keep your company safe by:

  • Requiring all users and admins to register for MFA using the Microsoft Authenticator app or any third-party application using OATH TOTP.
  • Challenging users with MFA, mostly when they show up on a new device or app, but more often for critical roles and tasks.
  • Disabling authentication from legacy authentication clients that can't do MFA.
  • Protecting admins by requiring extra authentication every time they sign in.

MFA is an important first step in securing your company, and security defaults make enabling MFA easy to implement. If your subscription was created on or after October 22, 2019, security defaults might have been automatically enabled for you—you should check your settings to confirm.


For more information about security defaults and the policies they enforce, see What are security defaults?

To enable security defaults (or confirm they're already enabled)

  1. Sign in to the Microsoft 365 admin center with security administrator, Conditional Access administrator, or Global admin credentials.

  2. In the left pane, select Show All, and then under Admin centers, select Azure Active Directory.

  3. In the left pane of the Azure Active Directory admin center, select Azure Active Directory.

  4. From the left menu of the Dashboard, in the Manage section, select Properties.

    Screenshot of the Azure Active Directory admin center showing the location of the Properties menu item.

  5. At the bottom of the Properties page, select Manage Security defaults.

  6. In the right pane, you'll see the Enable Security defaults setting. If Yes is selected, then security defaults are already enabled and no further action is required. If security defaults are not currently enabled, then select Yes to enable them, and then select Save.

Conditional Access


If you've been using security defaults, you'll need to turn them off before using Conditional Access. You can use either security defaults or Conditional Access policies, but you can't use both at the same time.

If your company or business has complex security requirements or you need more granular control over your security policies, then you should consider using Conditional Access instead of security defaults to achieve a similar or higher security posture.

Conditional Access lets you create and define policies that react to sign-in events and request additional actions before a user is granted access to an application or service. Conditional Access policies can be granular and specific, empowering users to be productive wherever and whenever, but also protecting your organization.

Security defaults are available to all customers, while Conditional Access requires one of the following plans:

  • Azure Active Directory Premium P1 or P2
  • Microsoft 365 Business Premium
  • Microsoft 365 E3 or E5
  • Enterprise Mobility & Security E3 or E5

If you want to use Conditional Access to configure policies, see the following step-by-step guides:

To learn more about Conditional Access, see What is Conditional Access? For more information about creating Conditional Access policies, see Create a Conditional Access policy.


If you have a plan or license that provides Conditional Access but haven't yet created any Conditional Access policies, you're welcome to use security defaults. However, you'll need to turn off security defaults before you can use Conditional Access policies.

Next objective

Protect your administrator accounts in Microsoft 365 Business Premium