# Managed Devices SHOULD be required to register MFA

Managed Devices SHOULD be required to register MFA. A Maester check for Entra ID, Conditional Access.

Source: https://maester.dev/docs/tests/CISA.MS.AAD.3.8

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<div class="test-byline"><div class="test-byline-avatars"><a class="test-byline-avatar test-byline-avatar--author" href="/contributors/soulemike" title="Michael Soule · Original author"><img src="https://github.com/soulemike.png" alt="Michael Soule" width="28" height="28" loading="lazy" decoding="async" /></a><a class="test-byline-avatar" href="/contributors/michaelmsonne" title="Michael Morten Sonne · Co-contributor"><img src="https://github.com/michaelmsonne.png" alt="Michael Morten Sonne" width="28" height="28" loading="lazy" decoding="async" /></a></div><div class="test-byline-meta"><span class="test-byline-text">Contributed by <a href="/contributors/soulemike">Michael Soule</a> with <a href="/contributors/michaelmsonne">Michael Morten Sonne</a></span><a class="test-byline-link" href="/contributors">All contributors →</a></div></div>

<p class="test-part">Part of <a href="/docs/tests/cisa">CISA</a> · Entra ID · Conditional Access · <a href="/docs/tests">All checks</a></p>

```powershell title="Run this check"
Invoke-Maester -TestId CISA.MS.AAD.3.8
```

## Overview

Managed Devices SHOULD be required to register MFA.

Rationale: Reduce risk of an adversary using stolen user credentials and then registering their own MFA device to access the tenant by requiring a managed device provisioned and controlled by the agency to perform registration actions. This prevents the adversary from using their own unmanaged device to perform the registration.

#### Remediation action:

Create a Conditional Access policy requiring a user to be on a managed device when registering for MFA.

1. In **Entra** under **Protection** and **Conditional Access**, select **[Policies](https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessBlade/~/Policies/fromNav/)**.
2. Click on **New policy**
3. Under **New Conditional Access policy**, configure the following policy settings in the new Conditional Access policy, per the values below:
    * Users > Include > **All users**
    * Target resources > User actions > **Register security information**
    * Access controls > Grant > Grant Access > **Require device to be marked as compliant** and **Require Microsoft Entra hybrid joined device** > For multiple controls > **Require one of the selected controls**
4. Click **Save**.

#### Related links

* [Entra admin center - Conditional Access | Policies](https://entra.microsoft.com/#view/Microsoft_AAD_ConditionalAccess/ConditionalAccessBlade/~/Policies/fromNav/)
* [CISA Strong Authentication & Secure Registration - MS.AAD.3.8v1](https://github.com/cisagov/ScubaGear/blob/main/PowerShell/ScubaGear/baselines/aad.md#msaad38v1)
* [CISA ScubaGear Rego Reference](https://github.com/cisagov/ScubaGear/blob/main/PowerShell/ScubaGear/Rego/AADConfig.rego#L431)

## Details

<details>
<summary>Every attribute of this check</summary>

| Field | Value |
| --- | --- |
| Test ID | CISA.MS.AAD.3.8 |
| Severity | Medium |
| Suite | CISA |
| Product | Entra ID |
| Feature | Conditional Access |
| Area | Authentication |
| Resource type | Tenant |
| User impact | Medium |
| Implementation cost | Medium |
| MITRE ATT&CK | T1078.004 Cloud Accounts, T1098.005 Device Registration |
| Supports benchmark | CISA SCuBA Secure Configuration Baselines for Microsoft 365 (version ScubaGear main, 2026-10-11), requirement MS.AAD.3.8 |
| Criticality | SHOULD |
| Upstream requirement | MS.AAD.3.8v1 |
| Supports controls | cisa-scuba:MS.AAD.3.8, nist-800-53-r5:AC-20b, nist-800-53-r5:IA-3 |
| PowerShell test | [Test-MtCisaManagedDeviceRegistration](https://github.com/maester365/maester/blob/main/tests/cisa/entra/Test.CISA.MS.AAD.3.8.ps1) |
| Services | Graph |
| Compatible licenses | AAD_PREMIUM |

</details>

## Source

- Test: [`tests/cisa/entra/Test.CISA.MS.AAD.3.8.ps1`](https://github.com/maester365/maester/blob/main/tests/cisa/entra/Test.CISA.MS.AAD.3.8.ps1)
- Documentation: [`tests/cisa/entra/Test.CISA.MS.AAD.3.8.md`](https://github.com/maester365/maester/blob/main/tests/cisa/entra/Test.CISA.MS.AAD.3.8.md)