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 provision 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.

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 perform 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, and select the users and groups you want this policy to apply to.
    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.

        Note

        Temporary Access Pass does not work for guest users.

      2. 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 Access controls > Grant.
    1. Select Grant access.
    2. Select Require multi-factor authentication.
    3. Click Select.
  7. Set Enable policy to On.
  8. Then select Create.

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 in addition to 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, and select the users and groups you want this policy to apply to.
    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.
    4. Select Done on the Locations blade.
    5. Select Done on the Conditions blade.
  7. Under Access controls > Grant.
    1. Select Block access.
    2. Then click Select.
  8. Set Enable policy to On.
  9. Then select Save.

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