Plan a Microsoft Entra Multifactor Authentication System for Your Business

Implementing a Microsoft Entra Multifactor Authentication (MFA) system is a crucial step in securing your business's digital assets. Microsoft Entra MFA provides an additional layer of security to prevent unauthorized access to your organization's resources.

First, you'll need to decide on the authentication methods you want to use. According to the Microsoft Entra MFA setup process, you can choose from various methods, including phone call, text message, or authenticator app.

Having multiple methods increases the security of your system, as a user will need to complete a second form of verification to access your organization's resources. This can be set up to require users to use a specific method or a combination of methods to authenticate.

Start by identifying the users who will require MFA and assigning them to a group in Azure Active Directory (Azure AD). This will allow you to manage and monitor their authentication settings.

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Increasing security is crucial, especially for registered users. You can prompt users to set up the Microsoft Authenticator app during sign-in, allowing you to move them to a more secure method.

Microsoft now offers a public preview of functionality that allows you to control who is prompted, enabling targeted campaigns to move users to the more secure method. This can be done by group, making it easier to manage and roll out the change.

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Selecting the right multifactor authentication (MFA) methods for your organization is crucial for ensuring security and usability. You can choose from a variety of methods, including Windows Hello for Business, Microsoft Authenticator app, FIDO2 security key, and more.

It's essential to evaluate each method in terms of security, usability, and availability. For example, the Microsoft Authenticator app provides a robust user experience and meets the National Institute of Standards and Technology (NIST) Authenticator Assurance Level 2 requirements.

To control the authentication methods available in your tenant, you can use the Microsoft Entra ID settings. For instance, you can block less secure methods like SMS verification, which is not as secure as other options.

You can also enable multiple MFA methods to provide users with a backup option in case their primary method is unavailable. This is especially useful when choosing methods that will be used in your tenant.

Here are some of the available authentication methods, along with how to manage them and their scoping options:

Manage SMS sign-in for primary authentication in authentication policySMS sign-in can be scoped to users and groups.Voice callsAuthentication methods policy

By considering these factors and options, you can choose the best MFA methods for your organization's needs.

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Planning your user session lifetime is crucial for a seamless multifactor authentication experience. This involves determining how frequently you want to prompt your users for authentication.

Asking users for credentials too often can lead to unintentional credential supply to malicious prompts. Microsoft Entra ID offers multiple settings to control reauthentication frequency.

Configuring settings that balance business needs with user experience is key. Consider using devices with Primary Refresh Tokens (PRT) for an improved user experience.

Reducing session lifetime with sign-in frequency policy should only be done in specific business use cases. For more information, see Optimize reauthentication prompts and understand session lifetime for Microsoft Entra multifactor authentication.

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Planning a secure setup for your Microsoft 365 account is crucial. For a guided walkthrough of many of the recommendations in this article, see the Microsoft 365 Configure multifactor authentication guided walkthrough.

Setting up multifactor authentication is a great way to boost security. This process can be initiated through the Microsoft 365 Configure multifactor authentication guided walkthrough.

Using a guided walkthrough can save you time and ensure you don't miss any important steps. The Microsoft 365 Configure multifactor authentication guided walkthrough is a great resource to have at your disposal.

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If your users were enabled using per-user MFA, you should consider converting them to Conditional Access based MFA for better security and management. This is because Conditional Access provides more granular control over user access.

To start the conversion process, enable Conditional Access for all users. This will allow you to set up policies that control access to specific resources based on user risk level, location, and other factors. For more information, see Create a Conditional Access policy.

Manually disabling per-user multifactor authentication is the next step in the conversion process. This will help you avoid any potential conflicts or issues that may arise from having both per-user MFA and Conditional Access enabled at the same time.

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To increase the security of registered users, consider moving them to more secure methods like the Microsoft Authenticator app. This app provides a more secure way to authenticate users compared to SMS or voice calls.

You can prompt users to set up the Microsoft Authenticator app during sign-in, and control who is prompted by group. This targeted approach helps move users to the more secure method.

Enable more than one MFA method so users have a backup in case their primary method is unavailable. This is especially important for security.

Choose authentication methods for MFA from a list of available options, evaluating each in terms of security, usability, and availability. The Microsoft Authenticator app provides the best user experience and multiple modes.

Consider blocking the least secure methods, such as SMS, for added security.

Here's a summary of authentication methods that can be controlled in your tenant:

Manage SMS sign-in for primary authentication in authentication policySMS sign-in can be scoped to users and groups.Voice callsAuthentication methods policy

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User registration is a crucial step in setting up multifactor authentication. It involves getting users registered to use Microsoft Entra multifactor authentication.

Some authentication methods, like Voice and SMS, allow preregistration, which can save users time and effort. This means users can pre-register their authentication methods before they're actually needed.

Administrators must determine how users will register their methods, as different methods require different levels of user interaction. This can be a challenge, especially for large organizations with many users.

Authentication methods like the Authenticator App require user interaction, which can be a bit more complicated to set up. But with the right approach, it can be done efficiently and effectively.

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System Integration is a crucial step in planning a seamless experience for your users. You'll need to meet the necessary prerequisites to proceed.

To integrate your on-premises systems with Microsoft Entra ID, you'll need to configure chosen authentication methods. This will allow your applications to make use of Conditional Access policies.

Legacy and on-premises applications that don't authenticate directly against Microsoft Entra ID require additional steps. You can integrate them by using Microsoft Entra application proxy or Network policy services.

Here are the steps to integrate your on-premises systems:

When you plan a system, it's essential to have a recovery plan in place. This ensures that users can regain access to their accounts even if something goes wrong.

Having multiple MFA methods is crucial for this. This way, if one method is unavailable, users have a backup to fall back on.

If a user doesn't have a backup method available, you can provide them a Temporary Access Pass. This allows them to manage their own authentication methods or gain temporary access to resources.

You can also update their methods as an administrator. To do so, select the user in the Microsoft Entra admin center, then select Entra ID > Authentication methods and update their methods.

In case of an emergency, it's helpful to have a list of steps to follow:

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