Manage authentication methods in Microsoft Entra ID through the authentication methods policy, which controls which methods users can register and use. Decide which methods are allowed, scope them by group or user type, and remove methods you no longer want in use. Regularly review registration, especially for privileged users and external identities.
What the authentication methods policy actually changes
The authentication methods policy is the control plane for sign-in options in microsoft entra id. It determines which methods users can register, which methods they can use at sign-in, and which populations are in scope. In practice, that means you are governing the accepted proofing and sign-in paths, not just ticking a feature on or off.
Because the policy is scoped, the same tenant can allow different methods for different groups or user types. That is useful when you want stronger methods for administrators, different expectations for guests or external identities, or a phased rollout that avoids breaking existing access while you modernise the estate.
Good management also means understanding that a method is only useful if it is actually available in the places people authenticate from. For example, if you allow a method but do not support the recovery path, help desk process, device posture, or user enrollment flow, the result is often friction, shadow exceptions, or reuse of weaker alternatives.
How to decide which methods to allow and where to scope them
Start with the methods that match your risk profile and user population. The practical question is not “which method exists?”, but “which method gives us the sign-in assurance we need without creating an unusable recovery story?”. For workforce populations, stronger options usually belong at the centre of the policy, with weaker or legacy options constrained or removed where possible. NHIMG’s MFA Guide is useful if you need to compare common methods and rollout trade-offs in more detail.
Scope matters as much as method choice. If privileged users, contractors, and external identities all receive the same registration and usage rules, you usually end up over-permitting the highest-risk populations or under-serving the lowest-friction ones. Separate policy decisions by group or user type so that stronger methods can be required where the blast radius of compromise is highest.
Method selection should also account for how the method can be attacked. SMS, OTP relay, push fatigue, and token theft are operationally different failure modes from phishing-resistant sign-in methods. If your policy still allows a weaker method for a high-value population, treat that as a conscious risk decision rather than a default configuration.
What to review, remove, and monitor over time
Authentication methods are not a set-and-forget control. Review what users have registered, what is still permitted, and whether old options remain usable because they were never removed from policy. The biggest mistakes are usually policy drift, stale registration data, and methods left enabled for compatibility long after the business no longer needs them.
Review should be especially strict for privileged users and external identities because those groups are disproportionately valuable to attackers and often have more complex access paths. A privileged account with a weak or redundant authentication path creates more exposure than the same method on a low-impact account. External identities also need clear boundaries so that tenant trust does not expand faster than governance.
When you retire a method, verify that you are not leaving behind a recovery backdoor, a help desk exception, or an alternate enrollment path that recreates the same risk. If the tenant still needs a legacy option for a transition period, time-box it, document the exception, and measure its actual use so you know when it can be removed.
Risk and Threat Considerations
Weak or over-permitted authentication methods are a common route to account takeover, especially when attackers can exploit MFA fatigue, OTP relay, social engineering, or stolen tokens. The risk is not just that one account gets accessed, but that the method itself becomes the easiest path into higher-privilege access, sensitive applications, or tenant-wide control.
Failure mechanism: Users register a method that is easier to phish, relay, or socially engineer than the organisation intends, or an allowed method remains available after the business no longer wants it in use. That creates a durable gap between the policy on paper and the authentication paths attackers can actually abuse.
Impact: Compromise can lead to persistent account access, privilege escalation, session theft, lateral movement through trusted sign-ins, and unnecessary dependence on help desk recovery. In higher-value environments, that can also weaken incident response because the attacker inherits a legitimate authentication path rather than a clearly malicious one.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
NIST SP 800-63, NIST SP 800-53 Rev 5 and OWASP ASVS set the technical controls, while ISO/IEC 27001:2022 defines the regulatory obligations.
| Framework | Control / Reference | Relevance |
|---|---|---|
| NIST SP 800-63 | Digital Identity Guidelines | Authentication method choice and assurance levels are central to Entra ID sign-in policy. |
| Recommendation — Use assurance guidance to align allowed methods with the required sign-in strength. | ||
| NIST SP 800-53 Rev 5 | IA-2 — Identification and Authentication (Organizational Users) | Workforce sign-in methods are governed by organizational user authentication controls. |
| IA-5 — Authenticator Management | The policy governs registration, use, and retirement of authenticators and related lifecycle state. | |
| Recommendation — Apply organizational authentication controls to restrict approved sign-in methods. Manage authenticators through lifecycle controls for registration, rotation, and removal. | ||
| OWASP ASVS | V6 — Authentication | Method selection and sign-in strength map directly to application authentication requirements. |
| Recommendation — Validate that supported methods meet authentication strength requirements. | ||
| ISO/IEC 27001:2022 | A.5.15 — Access control | Scoped method allowance and removal are part of access-control governance. |
| Recommendation — Document and enforce which authentication methods each user population may use. | ||
Practitioner Guidance
What to prioritise: Put your strongest methods on the populations whose compromise would matter most, then narrow or remove weaker options only after you have confirmed the enrollment and recovery path is workable. The most important test is whether the policy still permits an attacker-friendly method for privileged or externally reachable accounts.
What to verify: Check both effective policy and observed registration state. A clean configuration is not enough if users have already enrolled in a method you intended to retire, or if help desk processes can reintroduce it through exceptions.
Decision rule: If a method can be phished, relayed, or reused easily, do not leave it broadly available for high-risk groups unless there is a documented transition requirement and a removal date. If the method is still needed, constrain it tightly and monitor its use.
Practitioner takeaway: Manage authentication methods as a living assurance policy, not a catalog setting, because the real control is which sign-in paths remain usable for the people and privileges that matter most.
Related resources from NHI Mgmt Group
- How do you detect changes to user authentication methods in Microsoft Entra ID?
- How do you manage and evaluate application consent requests in Microsoft Entra ID?
- Should you use password hash sync, pass-through authentication, or federation with Microsoft Entra ID?
- How do you block legacy authentication with Conditional Access in Microsoft Entra ID?