TL;DR: Passwordless and Zero Trust programmes stall when enterprises cover human users but leave machines, devices, and interactions with inconsistent authentication and lifecycle controls, while SCIM-based integration is meant to streamline user changes across the identity stack, according to Axiad. The practical issue is not password removal alone, but whether identity governance can actually extend across every credential type and every non-human endpoint.
At a glance
What this is: This article says passwordless and Zero Trust break down when enterprises cover users but leave machines, devices and interactions outside the same authentication and lifecycle model.
Why it matters: IAM teams need to treat non-human endpoints as first-class identities, because inconsistent controls across users, devices and certificates create the gaps passwordless is supposed to close.
Context
Passwordless authentication only works as an identity programme when the same governance model covers human users, machines, devices and digitally signed interactions. If one identity class still relies on weaker or separate controls, the programme becomes fragmented and the Zero Trust story stops at the human login.
The practical issue is not password removal alone. It is whether the identity stack can issue, bind, revoke and verify credentials consistently across workforce access, device authentication, certificate-based trust and message signing without creating unmanaged exceptions.
Key questions
Q: What breaks when passwordless covers users but not machines?
A: The programme stops being identity-first and becomes a partial login change. Users may authenticate without passwords, but devices, certificates and signed interactions still depend on separate trust controls. That split creates unmanaged exceptions, inconsistent revocation paths and weaker assurance across the environment.
Q: Why do passwordless and Zero Trust programmes need SCIM?
A: Because identity state has to move consistently across systems if authentication and access decisions are going to remain aligned. SCIM helps propagate joiner, mover and leaver events so downstream applications do not lag behind the source of truth. Without that synchronisation, policy drift becomes a lifecycle problem, not just an access problem.
Q: When should organisations prioritise machine certificates over more user MFA?
A: When the main gap is not human login friction but unmanaged device, application or interaction trust. If machines, printers, endpoints or signed content remain outside the governance model, adding more user MFA does not close the largest exposure. Certificate-based trust then becomes the higher-priority control.
Q: How should security teams govern passwordless authentication for enterprise access?
A: Security teams should govern passwordless authentication the same way they govern other privileged identity paths: assign ownership, define enrollment standards, enforce expiry, and require rapid revocation. Passwordless reduces phishing exposure, but it still depends on device integrity, recovery controls, and policy enforcement. Treat it as an identity lifecycle problem, not only an authentication upgrade.
Technical breakdown
Why passwordless fails when machine identities are excluded
Passwordless changes the way a user proves identity, but it does not remove the need for trust anchors behind the session. In this article’s model, machines, devices and signed interactions still require certificates, device attestation or other authenticators that can be bound to the right entity and lifecycle state. If those non-human identities are handled differently from users, then the organisation has not moved to passwordless in an identity-first sense. It has only shifted the human login step while leaving machine trust fragmented across separate controls and platforms.
Practical implication: Treat passwordless as an identity architecture decision, not a login experience change, and include non-human credentials in the same governance scope.
How SCIM changes identity lifecycle for passwordless programmes
SCIM is an identity provisioning standard that synchronises user changes between systems so joiner, mover and leaver actions can be automated. In the context of this article, SCIM matters because passwordless and Zero Trust rely on rapid consistency between the identity provider and the systems that consume identity state. If user status, group membership or deprovisioning lags across the stack, the authentication model and the access model drift apart. That drift matters even more when multiple credential types and device populations depend on the same source of truth.
Practical implication: Use SCIM to keep identity lifecycle changes aligned across downstream systems, especially where passwordless access depends on current account state.
Where certificate-based trust becomes the control plane for machines
For non-human identities, certificates often become the credential that replaces or supplements passwords. That makes PKI a control plane for machine trust, not just a certificate vending mechanism. The article points to email signing, document signing and device authentication as examples where certificates prove origin, integrity and device legitimacy. The governance challenge is lifecycle management: issuance, binding, rotation and revocation must be reliable or the organisation accumulates stale trust in devices and interactions that users can no longer see.
Practical implication: Manage machine certificates as governed identities with explicit issuance and revocation processes, not as one-off technical artifacts.
Breaches seen in the wild
- Co-op cyber attack 2025: Attackers linked to Scattered Spider tricked their way into a Co-op employee account and stole personal data of all 6.5 million members.
Read and download The State of NHI & AI Agent Breach Report 2026, covering 150+ breaches impacting Non-Human Identities including AI Agents.
NHI Mgmt Group analysis
Passwordless is not a user-authentication project; it is an identity coverage problem. The article’s real point is that password removal does not create complete trust unless machines, devices and signed interactions are governed in the same model as users. When organisations narrow the programme to workforce login only, they create an identity boundary that attackers can still work around. The practitioner conclusion is simple: coverage matters more than branding.
SCIM-driven lifecycle consistency is the missing operational link in many passwordless programmes. Joiner, mover and leaver events have to propagate cleanly or the access layer and the source of truth diverge. That divergence is especially damaging in hybrid environments where users, devices and applications all consume identity state differently. The implication is that lifecycle discipline, not just authentication choice, determines whether passwordless holds up at scale.
Non-human identities should be treated as first-class citizens in identity-first design. Certificates, device credentials and signed interactions are not side issues once passwordless becomes the strategy. They are the trust fabric that makes the strategy defensible. If those controls sit outside the core IAM operating model, the organisation creates a false sense of Zero Trust maturity.
PKI becomes the governance layer for machine trust when passwords disappear. In this model, certificate issuance, binding and revocation define whether devices and interactions remain trustworthy over time. The article usefully exposes the structural gap many teams miss: human authentication can modernise faster than machine identity governance. Practitioners should therefore judge passwordless by end-to-end identity coverage, not by MFA adoption alone.
What this signals
Coverage, not just authentication style, is the deciding variable. Passwordless programmes fail structurally when they stop at the user login and leave machine identities, devices and signed interactions on separate trust paths. The programme question is whether your IAM model can govern every credential type with one lifecycle.
Machine identity turns passwordless from a UX change into a governance change. Once certificates and device credentials become part of the trust boundary, teams need to think in terms of issuance, binding, rotation and revocation rather than only MFA adoption.
Identity-first design only works when lifecycle controls are consistent. A passwordless rollout that lacks synchronised joiner, mover and leaver handling will drift over time, especially in hybrid estates where users and non-human endpoints consume identity state differently.
For practitioners
- Define passwordless scope across every identity class Map users, devices, service endpoints and signed interactions into the same authentication and lifecycle architecture before expanding rollout.
- Automate identity state propagation with SCIM Ensure joiner, mover and leaver changes update downstream applications quickly enough that authentication and access policy stay aligned.
- Bring machine certificates into IAM governance Track certificate issuance, binding, rotation and revocation as part of identity operations, not as an isolated PKI activity.
- Reduce workaround pressure on workforce MFA Tune the user experience so employees do not bypass controls when passwordless or MFA becomes a daily requirement.
Key takeaways
- Passwordless only reduces risk when the identity model includes users, machines, devices and signed interactions, not just workforce login.
- SCIM and certificate governance are operationally important because lifecycle drift can undermine the trust model faster than authentication improvements can strengthen it.
- Practitioners should measure passwordless success by identity coverage and lifecycle consistency, not by how many users have stopped typing passwords.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
OWASP Non-Human Identity Top 10 addresses the attack and risk surface, while NIST SP 800-53 Rev 5, NIST CSF 2.0 and CIS Controls v8 set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| OWASP Non-Human Identity Top 10 | NHI-04 — Insecure Authentication | Passwordless adoption fails when non-human identities are authenticated inconsistently across the stack. |
| NHI-01 — Improper Offboarding | SCIM-based lifecycle gaps can leave stale access and certificates active after identity changes. | |
| Recommendation — Apply NHI-04 to align authentication methods across users, devices and machine credentials. Use NHI-01 to ensure leaver events revoke machine and user access paths without delay. | ||
| NIST SP 800-53 Rev 5 | IA-5 — Authenticator Management | The article centres on managing authenticators such as passwords, tokens and certificates. |
| IA-9 — Service Identification and Authentication | Machine and device authentication is central to the article’s passwordless model. | |
| Recommendation — Enforce IA-5 to govern issuance, rotation and revocation of authenticators across the identity stack. Use IA-9 to authenticate services, devices and other non-human identities with governed credentials. | ||
| NIST CSF 2.0 | PR.AA-05 — Access Permissions, Entitlements and Authorizations | Passwordless still depends on entitlement consistency after authentication succeeds. |
| Recommendation — Apply PR.AA-05 to keep access decisions aligned with current identity state across systems. | ||
| CIS Controls v8 | CIS-5 — Account Management | The post highlights the need to manage user and machine identity changes across connected systems. |
| Recommendation — Use CIS-5 to standardise account and identity lifecycle handling across users and devices. | ||
Key terms
- Passwordless Authentication: An authentication approach that removes passwords and uses a device-bound cryptographic key plus local user verification. It reduces phishing and replay risk, but it only improves assurance when enrollment, recovery, and revocation are tightly governed.
- Machine Identity: The digital identity of a machine, device, or workload, such as a server, container, or VM, used to authenticate it within a network. Sometimes used interchangeably with NHI, though NHI is the broader category.
- Scim: System for Cross-domain Identity Management is the standard used to exchange user and group lifecycle data between an identity provider and an application. In production, the protocol only solves part of the problem. The harder issue is whether the implementation preserves attributes, order, and tenant scope consistently across real directory sources.
- Certificate Lifecycle Management: The governance of digital certificates from issuance through renewal and revocation, ensuring certificates are valid, monitored, and rotated before expiry. Expired certificates are a leading cause of outages and unplanned security gaps.
Deepen your knowledge
NHI governance, machine identity security, and identity lifecycle management are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are building or maturing an IAM programme, it is worth exploring.
Published by the NHIMG editorial team on June 8, 2026.
Updated on October 7, 2026.
NHI Mgmt Group, the independent authority on Non-Human Identity, IAM, and Agentic AI security. nhimg.org