Identity-first passwordless must cover users, machines and devices

At a glance

What this is: This is an independent analysis of how identity-first passwordless and SCIM-based lifecycle automation affect user, machine, and device authentication.

Why it matters: It matters because IAM teams have to govern humans and non-human identities through one access model without creating usability workarounds or leaving machines unauthenticated.

👉 Read Axiad's analysis of identity-first passwordless and machine authentication

Context

Passwordless authentication is not just a user-experience project. In this article, the underlying problem is that many organisations are trying to improve workforce access while leaving machine and device identities outside the same governance model. That creates a split programme where people may get stronger authentication but service endpoints, certificates, and other non-human identities remain unevenly controlled.

The article argues for an identity-first approach that spans users, machines, devices, email, and digital documents. For IAM and security teams, the practical issue is whether authentication, provisioning, and lifecycle management are coordinated across those identity types or handled as disconnected controls. In mature programmes, that distinction decides whether passwordless reduces risk or simply shifts it elsewhere.

Key questions

Q: How should security teams extend passwordless beyond workforce users?

A: They should start by separating human authentication from machine authentication, then map which devices, certificates, and service interactions need distinct control paths. Passwordless for people is only one layer. The stronger programme links authenticators, lifecycle automation, and verification rules so that non-human identities are covered instead of being left as exceptions.

Q: Why do machine identities complicate Zero Trust programmes?

A: Because Zero Trust assumes every subject can be verified continuously, yet machines and devices often authenticate through certificates, tokens, or embedded trust that are managed differently from users. If those identities are not inventoried and lifecycle-controlled, the trust boundary becomes inconsistent and attackers can move through the weakest credential class.

Q: What fails when MFA is unpopular with employees?

A: Adoption fails when the user experience is so poor that people search for workarounds, reuse weaker paths, or avoid the control altogether. That is not just a usability problem. It becomes a governance problem because the organisation has a policy on paper but not a reliable enforcement pattern in practice.

Q: How do organisations govern certificates and device identities alongside IAM?

A: They should manage certificates and device identities as first-class identity objects, not as sidecar infrastructure. That means defining issuance, renewal, and revocation ownership, then connecting those actions to joiner, mover, and leaver processes so machine trust does not drift away from human governance.

Technical breakdown

Passwordless authentication and MFA adoption friction

Passwordless reduces dependence on shared or reusable secrets by replacing memorised credentials with stronger authenticators such as tokens, biometrics, or device-bound methods. The technical challenge is not the authentication factor itself, but whether the rollout fits how people actually work. If MFA is slow, confusing, or inconsistent across applications, users look for workarounds, which weakens the control even when the policy is sound. In practice, passwordless succeeds only when identity assurance, usability, and application coverage are designed together.

Practical implication: measure where users bypass MFA or choose weaker paths, then remove friction before expanding passwordless enforcement.

Machine identity, certificates and PKI governance

Machines, devices, and application interactions need their own authentication model because they do not log in like humans. PKI gives those identities certificates that can verify origin, sign content, and support encrypted communication. The operational risk is that certificates become another unmanaged credential layer if issuance, renewal, and revocation are not tied to lifecycle controls. In mixed environments, machine identity governance matters because an unverified device can become the easiest path into otherwise well-defended systems.

Practical implication: inventory machine identities and certificate-bearing assets before extending passwordless beyond workforce users.

SCIM-driven identity lifecycle automation

SCIM is a standard for provisioning and deprovisioning identity data between systems so changes flow automatically rather than through manual ticketing. In this article, the important point is lifecycle consistency. When joiner, mover, and leaver events are automated, the identity provider remains the source of control and downstream systems do not drift out of sync. That matters for both humans and non-human identities because stale accounts, unused devices, and orphaned credentials are often a lifecycle failure rather than an authentication failure.

Practical implication: tie provisioning and deletion workflows to the authoritative identity source, not to separate admin processes.

NHI Mgmt Group analysis

Passwordless projects fail when they are treated as login modernisation instead of identity governance. The article shows the real issue is not whether users can authenticate with less friction, but whether the programme also covers machines, devices, and other non-human identities. When those actors remain outside the control model, the organisation improves one access path while leaving another exposed. Practitioners should treat passwordless as a cross-actor governance problem, not a front-end convenience project.

Machine identities are already part of the access estate, whether teams model them that way or not. The article’s emphasis on certificates, devices, and authenticated interactions reflects a broader reality: non-human identities now sit inside the same trust boundary as users. That means credential policy, lifecycle policy, and verification policy cannot be written for humans alone. IAM leaders should re-evaluate whether their programme is actually identity-first or merely user-first.

Lifecycle automation is the control that stops passwordless from becoming another partial rollout. The SCIM example matters because access problems often begin when creation, modification, and deletion are not synchronized across systems. Without automated lifecycle handling, even strong authentication leaves stale identities, obsolete devices, and inconsistent entitlements in place. Practitioners should measure whether identity changes move through the environment at the same speed as business change.

Identity-first architecture is now the practical bridge between human IAM and NHI governance. The article connects passwordless user authentication to machine certificates and device trust, which is exactly where many programmes fragment. That fragmentation is what attackers exploit: humans get modern controls while non-human identities lag behind. Security teams should use this as a cue to unify governance across workforce access, device identity, and machine credentials.

What looks like a passwordless initiative is increasingly a trust-boundary redesign exercise. Once organisations support multiple authenticators and machine certificates together, the programme starts deciding who and what is trusted, under what lifecycle conditions, and with which verification methods. That is an identity architecture decision, not a point-solution deployment. The implication for practitioners is to align authentication changes with Zero Trust and NHI governance rather than running them as separate tracks.

From our research:

• 80% of identity breaches involved compromised non-human identities such as service accounts and API keys, according to Ultimate Guide to NHIs.
• 91.6% of secrets remain valid five days after the targeted organisation is notified, showing a critical gap in remediation procedures.
• Read 52 NHI Breaches Analysis for breach patterns that show how stale credentials and weak offboarding turn identity gaps into incidents.

What this signals

Identity-first passwordless will increasingly be judged by coverage, not enthusiasm. If workforce authentication improves but machine identities remain outside the same control plane, the programme has only shifted the weak point. The practical question is whether lifecycle automation, certificate governance, and user authentication are managed as one estate or as three disconnected projects.

NHIMG data shows why this matters operationally: 97% of NHIs carry excessive privileges, which means authentication changes alone do not reduce blast radius. Teams that stop at login modernisation will still inherit over-permissioned machine and device identities unless entitlement governance is part of the design.

The next phase of IAM maturity is converged governance across users, devices, and machine identities. That means tying passwordless adoption to inventory, lifecycle, and verification controls so each identity type is governed at the point where trust is created and removed. Organisations that do this will reduce workarounds and close the gap between human IAM and NHI oversight.

For practitioners

• Map every credentialed actor in scope Build one inventory for users, devices, service endpoints, certificates, and authenticated interactions. Treat anything that proves identity or carries access as part of the same estate, even if ownership sits in different teams.
• Tie passwordless rollout to MFA exception analysis Identify where users resist MFA, where they use workarounds, and where application coverage is incomplete. Use those findings to sequence rollout instead of applying policy uniformly across all applications.
• Automate joiner, mover and leaver flows through the source of truth Use SCIM or equivalent provisioning logic so account creation, updates, and deletion are driven by authoritative identity data rather than manual administration. Extend the same discipline to certificates and device records where possible.
• Separate human authentication controls from machine authentication controls Do not assume a control that works for workforce users will work for servers, printers, or digital signing workflows. Define certificate issuance, renewal, and revocation paths for non-human identities explicitly.

Key takeaways

• Passwordless authentication is only effective when it is part of a broader identity governance model that includes machines and devices.
• Machine identities and certificates are already part of the access estate, so leaving them outside lifecycle control creates avoidable exposure.
• Automation of provisioning, deletion, and renewal is what keeps identity-first access from fragmenting into separate human and non-human control planes.

Key terms

• Passwordless authentication: An authentication approach that removes memorised passwords and relies on stronger factors such as device-bound credentials, biometrics, or cryptographic authenticators. In practice, it shifts security from secret reuse to assurance, but only works well when recovery, lifecycle, and fallback paths are controlled.
• Machine identity: A non-human identity used by devices, services, or applications to prove who or what they are to another system. It is typically expressed through certificates, keys, or tokens, and it must be governed like any other identity object with ownership, renewal, and revocation.
• SCIM: A standard for automating identity provisioning between systems so accounts and attributes can be created, updated, and removed consistently. It reduces manual administration, but its security value depends on the source of truth being accurate and the downstream systems honouring deletion and change events.
• PKI: Public key infrastructure is the certificate-based trust system that lets machines and people prove identity, sign content, and encrypt communications. In identity programmes, PKI is a governance layer as much as a technical one because issuance, renewal, and revocation determine whether trust remains valid.

Deepen your knowledge

NHI governance, agentic AI identity, and machine identity security are core topics in our NHI Foundation Level course, the industry's only accredited NHI security programme. If you are responsible for identity security strategy or NHI governance in your organisation, it is worth exploring.

This post draws on content published by Axiad: Ping Identity and Axiad on the identity-first partnership and passwordless authentication. Read the original.