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Require multifactor authentication (MFA) wherever your business systems support it, but do not treat every method as equally resistant to phishing. Prioritize administrator accounts, remote access, business email, file storage, and systems holding sensitive data. For those high-impact accounts, prefer phishing-resistant FIDO/WebAuthn authentication; use the strongest supported alternative when a service cannot provide it, and track the gap.
MFA combines at least two different factor types: something a user knows, has, or is. It adds a barrier when a password is compromised, but the strength of that barrier depends on the method. The guidance below draws on the National Institute of Standards and Technology (NIST) small-business MFA guidance, updated January 5, 2026, and its technical reference, NIST SP 800-63B-4, published in July 2025. SP 800-63B-4 addresses federal information systems, so use it as a technical reference—not as a determination that a private business meets a regulatory or contractual requirement.
Which MFA methods should a business prefer?
For sensitive systems and users with elevated privileges, start with phishing-resistant authentication based on FIDO and WebAuthn. NIST describes FIDO authenticators paired with the Web Authentication API as a common, widely available form of phishing-resistant authentication. In WebAuthn, verifier-name binding ties authentication to the verifier’s domain, helping prevent a credential from being used in a fraudulent site’s login session.
That can mean a separate FIDO2 security key or an authenticator built into a supported phone or computer. Neither option works everywhere: confirm that each business application and identity provider supports the method and that it fits the organization’s assurance requirements. NIST explains its recommendation in its small-business MFA guidance; the technical treatment of WebAuthn and phishing resistance appears in SP 800-63B-4.
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Passkeys are one type of authenticator that may use FIDO/WebAuthn. Their portability and recovery depend on how they are implemented and synchronized. NIST’s April 2024 announcement about syncable authenticators describes correctly implemented syncable authenticators as capable of phishing resistance, cross-device support, and simpler recovery. The current standard also calls for assessing risks such as control of, and recovery from, the account used to synchronize them. Check the actual synchronization and recovery model rather than assuming all passkeys behave identically.
How common fallback methods compare
| Method | Phishing and relay resistance | Compatibility, portability, and recovery | Enrollment, daily use, and support |
|---|---|---|---|
| FIDO/WebAuthn security key or platform authenticator | Phishing-resistant when correctly implemented and supported; WebAuthn can bind authentication to the verifier’s domain. | Check support in the actual business service and on employees’ devices. A hardware key is a separate device; a platform authenticator is built into a supported phone or computer. Plan for lost-device recovery. | Employees must enroll and know how to use the supported authenticator. Provide a recovery path and support for setup. |
| Syncable authenticator or passkey | Can be phishing-resistant when correctly implemented. | May work across devices and simplify recovery, but the synchronization account, control, and recovery model matter. Assess these risks for the chosen configuration. | Setup and daily use depend on the provider and devices. Explain which account synchronizes credentials and how employees recover access. |
| Authenticator-app one-time password (OTP) | Not phishing-resistant: a user-entered code can be relayed to an attacker during a fraudulent login. | Compatibility and recovery depend on the application and business service. Establish a recovery process before relying on it. | Employees enter a code during login. Support requirements depend on the app and enrollment process. |
| Push approval, preferably with number matching | Number matching is a stronger fallback than an ordinary approval prompt, but it is not equivalent to phishing-resistant FIDO/WebAuthn authentication. | Availability and recovery depend on the identity provider and enrolled device. | Teach employees to deny unexpected prompts and provide a support path for enrollment or device problems. |
| SMS or email code | Not phishing-resistant. CISA places text and email codes at the bottom of its listed SMB methods and advises using them only when stronger options are unavailable. | Availability and recovery vary by service and account configuration. | Use only when stronger supported methods are unavailable, and track the account as a gap to address. |
The method distinctions and fallback guidance are drawn from CISA’s guidance on implementing phishing-resistant MFA, NIST’s small-business guidance, and NIST SP 800-63B-4. The sources do not establish universal compatibility, comparative costs, or measured user-friction levels; check the services and devices your organization actually uses.
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Which business accounts should get MFA first?
Set a policy that requires MFA wherever it is supported. If rollout must happen in stages, begin where account compromise could expose business systems, communications, or sensitive information:
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- Administrator and privileged accounts: Prefer phishing-resistant authentication because these accounts can control other users or systems.
- Remote access: Require MFA for services employees use to reach the business environment from outside the office.
- Email and file storage: Protect accounts that can expose communications, shared documents, or links to other business services.
- Access to sensitive business data: Apply the strongest method available to users and services that handle that information.
These priorities follow CISA’s SMB MFA guidance and NIST’s small-business recommendations. For any account that does not support phishing-resistant MFA, enable its strongest available method and record the missing capability so it can be revisited.
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- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
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How to roll out MFA without creating recovery gaps
- Inventory systems and authentication options. List business applications, remote-access services, and other systems. For each, check whether MFA is available, whether FIDO/WebAuthn is supported, and whether more than one authenticator can be enrolled. NIST recommends inventorying systems and checking for stronger methods.
- Set and communicate the requirement. Define which accounts must use MFA and establish the priority order above. State which methods are acceptable for high-impact accounts and what to do when an application does not support the preferred option.
- Enroll employees and provide a support route. Give clear setup instructions for the authenticators available in your environment. Explain why MFA matters, how to recognize an unexpected request, and where to get help with enrollment. CISA recommends employee education, and NIST asks businesses to ensure employees understand setup and importance.
- Design recovery before enforcement. Where the service allows it, enroll multiple authenticators. Document identity checks for recovery and decide how staff can restore access after losing a device. Keep recovery codes securely according to the provider’s instructions; NIST discusses recovery codes and syncable-authenticator risks, but exact procedures vary by identity provider and assurance requirements. Do not let an urgent lockout become an informal, weaker bypass.
- Review access as jobs change. Limit access to what each role needs, restrict administrative privileges, and remove access that is no longer required. Revisit MFA enrollment and recovery arrangements when employees change roles or leave.
The NIST small-business MFA checklist frames useful rollout checks as questions: Have you inventoried systems to find which offer MFA? Have you enabled MFA on sensitive accounts and checked for phishing-resistant options? Do employees understand how to enable MFA and why it matters? Is there a policy requiring MFA and phishing-resistant MFA?
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What else belongs in an account-security policy?
- Use a business password manager to help employees create and store passwords; it supports good password practices but does not replace MFA.
- Keep a record of systems that lack the preferred method and the strongest method currently enabled on each.
- Make reporting an unexpected approval prompt or suspected account compromise part of employee guidance.
- Confirm method support, enrollment limits, and recovery steps in each service’s actual configuration before setting a business-wide requirement.
NIST lists password managers among additional account-security measures in its small-business guidance. This is implementation guidance, not a certification that a particular configuration satisfies a law, contract, or assurance level.
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- WORKS WITH 1000+ ACCOUNTS: Compatible with Google, Microsoft, and Apple. A single Security Key NFC secures 100 of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your Security Key NFC via USB-A and tap it, or tap it against your phone (NFC) to authenticate. No batteries, no internet connection, and no extra fees required.
- TRUSTED PASSKEY TECHNOLOGY: Uses the latest passkey standards (FIDO2/WebAuthn & FIDO U2F) but does not support One-Time Passwords. For complex needs, check out the YubiKey 5 Series.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
