Conditional Access: Securing security info registration

Securing when and how users register for Azure AD Multi-Factor Authentication and self-service password reset is possible with user actions in a Conditional Access policy. This feature is available to organizations who have enabled the combined registration. This functionality allows organizations to treat the registration process like any application in a Conditional Access policy and use the full power of Conditional Access to secure the experience. Users signing in to the Microsoft Authenticator app or enabling passwordless phone sign-in are subject to this policy.

Some organizations in the past may have used trusted network location or device compliance as a means to secure the registration experience. With the addition of Temporary Access Pass in Azure AD, administrators can provide time-limited credentials to their users that allow them to register from any device or location. Temporary Access Pass credentials satisfy Conditional Access requirements for multi-factor authentication.

Template deployment

Organizations can choose to deploy this policy using the steps outlined below or using the Conditional Access templates (Preview).

Create a policy to secure registration

The following policy applies to the selected users, who attempt to register using the combined registration experience. The policy requires users to be in a trusted network location, do multi-factor authentication or use Temporary Access Pass credentials.

  1. In the Azure portal, browse to Azure Active Directory > Security > Conditional Access.
  2. Select New policy.
  3. In Name, Enter a Name for this policy. For example, Combined Security Info Registration with TAP.
  4. Under Assignments, select Users and groups.
    1. Under Include, select All users.

      Warning

      Users must be enabled for the combined registration.

    2. Under Exclude.

      1. Select All guest and external users.

      2. Select Directory roles and choose Global administrator

        Note

        Temporary Access Pass does not work for guest users.

      3. Select Users and groups and choose your organization's emergency access or break-glass accounts.

  5. Under Cloud apps or actions, select User actions, check Register security information.
  6. Under Conditions > Locations.
    1. Set Configure to Yes.
      1. Include Any location.
      2. Exclude All trusted locations.
  7. Under Access controls > Grant.
    1. Select Grant access, Require multi-factor authentication.
    2. Select Select.
  8. Confirm your settings and set Enable policy to Report-only.
  9. Select Create to create to enable your policy.

After confirming your settings using report-only mode, an administrator can move the Enable policy toggle from Report-only to On.

Administrators will now have to issue Temporary Access Pass credentials to new users so they can satisfy the requirements for multi-factor authentication to register. Steps to accomplish this task, are found in the section Create a Temporary Access Pass in the Azure AD Portal.

Organizations may choose to require other grant controls with or in place of Require multi-factor authentication at step 6b. When selecting multiple controls, be sure to select the appropriate radio button toggle to require all or one of the selected controls when making this change.

Guest user registration

For guest users who need to register for multi-factor authentication in your directory you may choose to block registration from outside of trusted network locations using the following guide.

  1. In the Azure portal, browse to Azure Active Directory > Security > Conditional Access.
  2. Select New policy.
  3. In Name, Enter a Name for this policy. For example, Combined Security Info Registration on Trusted Networks.
  4. Under Assignments, select Users and groups.
    1. Under Include, select All guest and external users.
  5. Under Cloud apps or actions, select User actions, check Register security information.
  6. Under Conditions > Locations.
    1. Configure Yes.
    2. Include Any location.
    3. Exclude All trusted locations.
  7. Under Access controls > Grant.
    1. Select Block access.
    2. Then click Select.
  8. Confirm your settings and set Enable policy to Report-only.
  9. Select Create to create to enable your policy.

After confirming your settings using report-only mode, an administrator can move the Enable policy toggle from Report-only to On.

Next steps

Conditional Access common policies

Determine impact using Conditional Access report-only mode

Simulate sign in behavior using the Conditional Access What If tool

Require users to reconfirm authentication information