When should organisations require hardware-bound keys instead of synchronised passkeys?

Require hardware-bound keys for privileged access, regulated operations, and any workflow where origin assurance and device binding matter more than convenience. Synchronised passkeys can work for lower-risk user populations, but they should not be treated as equivalent when the business impact of account compromise is high.

Why This Matters for Security Teams

The decision between hardware-bound keys and synchronised passkeys is not just about login convenience. It is about whether the organisation needs a credential that stays tied to a specific device and physical possession, or one that can follow the user across a trusted ecosystem. For privileged accounts, regulated workflows, and high-impact operations, that distinction changes the blast radius of compromise. Guidance from the NIST Cybersecurity Framework 2.0 reinforces that identity controls should match business risk, not just user experience.

This matters because synchronised passkeys reduce phishing risk, but they also reduce the certainty that the authenticator is anchored to one controlled device. In environments where origin assurance, device attestation, or physical custody are part of the control objective, that tradeoff becomes material. NHI Mgmt Group notes that 90% of IT leaders say properly managing non-human identities is essential for a successful zero-trust implementation in its Ultimate Guide to NHIs, and the same principle applies here: stronger identity assurance is required where compromise is expensive to absorb. In practice, many security teams discover the gap only after a privileged session, fraud event, or audit finding has already shown that “passwordless” was not the same as “device-bound.”

How It Works in Practice

Hardware-bound keys should be required when the organisation needs a cryptographic authenticator that cannot be silently migrated to another device or cloud-synchronised ecosystem. That usually means administrator access, financial approvals, code signing, customer data administration, and production change control. A hardware-bound key gives stronger evidence that the authentication event came from a physically present token under direct user control, which is useful when policy, incident response, or compliance demands stronger origin assurance.

Synchronised passkeys are better suited to lower-risk populations and broad workforce use cases where usability and recovery are more important than strict device binding. Current guidance suggests treating them as strong phishing-resistant authenticators, but not as equivalent to hardware-bound keys for every workflow. The practical difference is in the control objective: hardware-bound keys constrain where the credential can live, while synchronised passkeys optimise for portability and recovery across devices.

A workable policy usually combines authentication strength with contextual authorisation:

• Use hardware-bound keys for privileged access, especially where NIST Cybersecurity Framework 2.0 calls for stronger access governance.
• Allow synchronised passkeys for standard employee access where support burden and device churn are higher.
• Require device registration, phishing-resistant MFA, and recovery controls for both, but reserve the stricter binding requirement for sensitive roles.
• Track where passkey syncing is enabled, because recovery convenience can become an attack path if account recovery is weak.

For broader NHI governance context, the Ultimate Guide to NHIs is useful when teams want to align identity strength with operational risk rather than treat every authenticator as interchangeable. These controls tend to break down in BYOD-heavy environments because the organisation cannot reliably enforce device custody, local protection, and recovery hygiene at the same time.

Common Variations and Edge Cases

Tighter binding often increases operational friction, requiring organisations to balance stronger assurance against recovery complexity and user support cost. That tradeoff is most visible in hybrid work, shared device fleets, and high-turnover populations, where issuing and replacing hardware keys can become a bottleneck. Best practice is evolving, but there is no universal standard that says synchronised passkeys are always sufficient for sensitive access.

There are a few common edge cases. First, some organisations use hardware-bound keys only for tier-0 administrative access and allow synchronised passkeys everywhere else. That is often the right starting point. Second, some regulated environments need both strong authentication and explicit device inventory, which makes hardware binding easier to defend during audit. Third, if account recovery depends on help desk processes, the recovery path can become the weakest link regardless of authenticator type.

The most important question is not whether a passkey is “modern,” but whether the organisation needs device immobility, physical possession, and stronger origin assurance for the specific workflow. Where those conditions matter, hardware-bound keys remain the safer default. Where they do not, synchronised passkeys can improve adoption without materially increasing risk.

Related resources from NHI Mgmt Group

• When should organisations require CA-signed certificates for SAML?
• Should organisations use SSH certificates instead of long-lived keys?
• When should organisations require user interaction instead of autonomous agent action?
• When should organisations require step-up verification instead of wallet-only trust?