Require multifactor authentication (MFA) wherever your business systems support it, but do not treat every method as equally secure. Prioritize phishing-resistant FIDO/WebAuthn authentication for administrators and sensitive systems; use the strongest alternative each service supports when that option is unavailable. Decide how employees will recover access before enforcing MFA, so a lost device does not lead to an improvised bypass.
What MFA does—and why the method matters
MFA requires two or more different types of proof: something a user knows, such as a password; something they have, such as a security key or phone; or something they are, such as a biometric. A second factor adds a barrier if a password is compromised, but it does not make every sign-in method equally resistant to attack.
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The key distinction for business planning is phishing resistance. FIDO/WebAuthn authentication binds a sign-in to the legitimate service, making it harder for an attacker to capture and relay the authentication response from a fake login page. By contrast, a manually entered one-time passcode (OTP)—whether received by text or generated by an authenticator app—can be relayed during a phishing attack. MFA is valuable, but the method determines what kinds of attacks it can withstand.
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NIST’s current Digital Identity Guidelines, SP 800-63B-4, were published in July 2025. They are a federal technical standard and a useful reference for understanding authentication; they do not by themselves determine whether a particular private business’s setup satisfies a regulatory or contractual obligation. NIST’s small-business guidance, updated January 5, 2026, and CISA’s small-business advice provide practical implementation context. NIST small-business MFA guidance, NIST SP 800-63B-4, CISA guidance for securing your business
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Which MFA methods should a business prefer?
Choose a method your systems support, weighing phishing resistance alongside device compatibility, recovery, employee usability, and the support work required. There are no universal compatibility, cost, or user-friction figures that apply to every organization; check the services and devices your employees actually use.
| Method | Phishing and relay resistance | Compatibility, portability, and recovery | Enrollment and operational considerations |
|---|---|---|---|
| FIDO/WebAuthn security key or platform authenticator | Phishing-resistant when correctly implemented: WebAuthn uses verifier-name binding to tie authentication to the legitimate service’s domain. | A security key is a separate device; a platform authenticator is built into a supported phone or computer. Availability depends on the service and device. | Prefer for elevated privileges and sensitive systems where supported. Plan for enrollment, spare authenticators where feasible, and a verified lost-device recovery process. |
| Passkey or other syncable authenticator | NIST describes correctly implemented syncable authenticators such as passkeys as phishing-resistant. | Can support use across devices and simplify recovery, but synchronization, account control, and recovery arrangements affect the risk. Assess the specific configuration. | Native biometric or PIN features can support sign-in. Document how the organization’s chosen provider handles synchronization and account recovery. |
| Authenticator-app OTP | Stronger than password-only sign-in, but not phishing-resistant: an attacker can relay the manually entered code. | Requires access to the enrolled authenticator and a service that supports app-generated codes. Plan for device loss. | Use when stronger methods are unavailable; explain how employees should respond to unexpected sign-in requests and provide an enrollment support path. |
| Push approval, preferably with number matching | Number matching improves on ordinary push approval, but it is not equivalent to phishing-resistant FIDO/WebAuthn authentication. | Depends on the service’s supported push flow and the user’s enrolled device. Confirm what happens when that device is lost or replaced. | A practical interim or fallback option when phishing-resistant methods are not yet available. Teach employees to deny unexpected prompts. |
| SMS or email code | CISA places text and email codes at the bottom of its listed small-business options; codes can be captured or relayed. | Depends on access to the phone number or email account used for delivery. | Use only where stronger options are unavailable, and track accounts that still rely on it. |
NIST describes FIDO authenticators paired with the W3C Web Authentication API as the most common form of phishing-resistant authenticators widely available today. For a service that supports it, a FIDO2 security key is one external option; a supported phone or computer may have a built-in platform authenticator instead. Neither option is universal, so verify support in each service and against any assurance requirements that apply to your business.
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- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
NIST’s April 2024 announcement highlighted phishing resistance, cross-device support, and simplified recovery as possible benefits of correctly implemented syncable authenticators. Those benefits do not mean every passkey setup has the same recovery or account-control properties: assess how the selected provider synchronizes authenticators and restores access.
For detailed distinctions, consult NIST SP 800-63B-4, NIST’s small-business MFA guidance, CISA’s business guidance, and NIST’s April 2024 announcement on syncable authenticators.
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- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 NFC secures 100+ of your favorite accounts, including email, password managers, and more
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 NFC via USB and tap it, or tap it against your phone (NFC), to authenticate. No batteries, no internet connection, and no extra fees required
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it
- PRIMARY & SPARE KEYS: Just like having a spare house key, we recommend buying two YubiKeys - one for daily use and one as a spare. That way you’ll never get locked out of your accounts
Where should a business require MFA first?
Set a policy requiring MFA wherever it is supported, then prioritize accounts and services whose compromise would expose sensitive information or give an attacker broad access.
- Administrator and other privileged accounts: These can change systems, permissions, or other users’ access. Use phishing-resistant MFA where the service supports it.
- Remote access: Protect accounts that connect to business systems from outside the workplace.
- Email: A compromised business mailbox can expose sensitive conversations and provide access to other account-recovery flows.
- File storage and sensitive business data: Require MFA for services holding important records or confidential information.
- Other systems identified in your inventory: Extend the requirement across the organization and record any service that cannot yet support the preferred method.
For each account that cannot use a phishing-resistant method, enable the strongest option it does support and record the gap for follow-up. Limit access to what each job requires, restrict administrative privileges, and remove access when a person’s role changes or no longer needs it.
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- POWERFUL SECURITY KEY: The Security Key NFC is the essential physical passkey for protecting your digital life from phishing attacks. It ensures only you can access your accounts.
- 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.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
How to roll out MFA without creating avoidable lockouts
- Inventory systems and capabilities. List business applications, remote-access services, email, file storage, and other systems employees use. For each, check whether MFA is available, whether FIDO/WebAuthn or another phishing-resistant option is supported, and whether more than one authenticator can be enrolled.
- Set the requirement and priorities. Define a policy requiring MFA wherever supported. Start with administrators, remote access, email, file storage, and access to sensitive data; choose a phishing-resistant option for elevated users and sensitive systems when compatible.
- Choose a supported method for each account. Prefer FIDO/WebAuthn authentication where available. Where it is not, enable the strongest supported alternative and keep track of the service and account until the gap can be addressed.
- Prepare employees and support. Provide setup instructions for the actual services and devices your organization uses, explain why MFA matters, and make a clear support path available for enrollment problems. Teach employees not to approve unexpected prompts or share one-time codes.
- Define recovery before enforcement. Where feasible, enroll multiple authenticators. Document how support staff verify identity before restoring access, and test the process for a lost or replaced device. Follow the identity provider’s actual recovery controls and any assurance requirements that apply; avoid ad hoc bypasses.
- Review access as work changes. Revisit permissions when roles change, remove access that is no longer needed, and keep administrative privileges limited to people who require them.
Recovery and supporting account protections
Recovery is part of MFA security, not a separate convenience decision. A recovery process that lets anyone bypass the enrolled factor undermines the protection; a process that cannot restore legitimate access can leave employees locked out. Decide in advance which staff can authorize recovery, what identity checks they must perform, how the event is recorded, and how a lost authenticator is removed or replaced. Exact procedures depend on the identity provider and the assurance level your organization needs. NIST SP 800-63B-4 discusses recovery codes and risks associated with syncable authenticators; use it as a technical reference rather than assuming one procedure fits every service.
- Keep a record of which systems support multiple enrolled authenticators and which do not.
- Make recovery instructions available to the people who need them, without creating an informal route around identity checks.
- Review recovery and access arrangements when employees change roles or leave.
- Consider a business password manager as an additional account-security measure: it can help create and store passwords, but it does not replace MFA.
NIST’s small-business guidance frames useful policy checks as direct questions: have you inventoried systems to determine which offer MFA; enabled MFA on the most sensitive accounts and checked whether phishing-resistant options are available; ensured employees understand setup and importance; and adopted a policy requiring MFA, including phishing-resistant MFA where appropriate? Those checks can help turn an MFA rollout into an ongoing access-management practice.
Quick Recap
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- POWERFUL SECURITY KEY: The YubiKey 5 is a versatile physical passkey that protects your digital life from phishing attacks. It ensures only you can access your accounts.
- WORKS WITH 1000+ ACCOUNTS: Compatible with popular accounts like Google, Microsoft, and Apple. A single YubiKey 5 secures 100+ of your favorite accounts, including email, password managers, and more.
- FAST & CONVENIENT LOGIN: Plug in your YubiKey 5 via USB and tap it to authenticate. No batteries, no internet connection, and no extra fees required.
- MOST SECURE PASSKEY: Supports FIDO2/WebAuthn, FIDO U2F, Yubico OTP, OATH-TOTP/HOTP, Smart card (PIV), and OpenPGP. That means it’s versatile, working almost anywhere you need it.
- BUILT TO LAST: Made from tough, waterproof, and crush-resistant materials. Manufactured in Sweden and programmed in the USA with the highest security standards.
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