How should organisations govern access if IDaaS already handles sign-in?

Why This Matters for Security Teams

IDaaS solves authentication, but it does not solve governance. Once sign-in is delegated to a cloud identity provider, organisations still need a way to decide who should keep access, who should lose it, and what evidence proves the decision was made. That is where IGA becomes necessary: it provides lifecycle controls, access reviews, role validation, and policy enforcement across changing business conditions.

This distinction matters because access drift is usually a governance failure, not a login failure. A user can authenticate correctly through IDaaS and still retain outdated entitlements, excessive group membership, or access to systems tied to a previous project. NHI Management Group has highlighted how widespread this problem becomes when identities outnumber people and governance is weak in practice, especially in environments with service accounts and API keys; see the Ultimate Guide to NHIs and the Top 10 NHI Issues. The NIST Cybersecurity Framework 2.0 also reinforces that identity assurance and access governance are separate security functions, not interchangeable ones.

In practice, many security teams discover the gap only after a role change, acquisition, or audit has already exposed stale access that IDaaS never had reason to remove.

How It Works in Practice

Organisations should treat IDaaS as the authentication front end and IGA as the control plane for entitlement governance. IDaaS answers “is this user or workload who they claim to be right now?” IGA answers “should they still have this access, under current policy, and can that decision be evidenced?” Those are related questions, but they are not the same control.

A practical model usually includes four workflows:

• Joiner, mover, leaver processes that add, adjust, or revoke access based on HR, vendor, or system-of-record events.
• Periodic access certifications so managers or application owners review standing access and remove what is no longer justified.
• Policy enforcement for role-based access, segregation of duties, and privileged access requests.
• Audit trails that show who approved access, when it was reviewed, and what was revoked.

For NHI-heavy environments, the same governance logic must extend to service accounts, API keys, certificates, and other secrets. Current guidance suggests these identities should be inventoried, classified, and rotated on a defined schedule, because static credentials age into risk even when sign-in is strong. The Ultimate Guide to NHIs — Lifecycle Processes for Managing NHIs is a useful reference for that lifecycle view, while the OWASP Non-Human Identity Top 10 frames the common failure modes that appear when governance is missing.

Best practice is evolving toward policy-driven provisioning and deprovisioning, where access decisions are made from authoritative business data rather than manual tickets alone. These controls tend to break down in merged environments with inconsistent directory data because no single system can reliably determine ownership, entitlement origin, or business justification.

Common Variations and Edge Cases

Tighter governance often increases administrative overhead, requiring organisations to balance control quality against operational speed. That tradeoff becomes more visible in fast-moving engineering teams, contractor-heavy programs, and multi-cloud estates where access changes faster than review cycles.

One common edge case is privileged access. IDaaS may authenticate an admin successfully, but the real issue is whether privileged elevation should be time-bound, approved, and continuously revalidated through PAM or a similar control. Another is machine access. Service accounts and API keys are not “users” in the normal sense, so they often fall outside human-centric IGA workflows unless the platform is intentionally extended to cover NHI lifecycle and ownership.

There is no universal standard for this yet, but current guidance suggests organisations should avoid assuming that federation equals governance. Identity proof at sign-in does not replace access recertification, entitlement cleanup, or offboarding. The audit expectation is simple: if access can outlive its business need, there should be a documented control that detects and removes it. The Ultimate Guide to NHIs — Regulatory and Audit Perspectives is especially useful where auditors ask how access remains appropriate after the initial login event.

That gap is most visible in environments with shadow IT, unmanaged third-party integrations, or teams that inherit access through nested groups and never revisit it.

Related resources from NHI Mgmt Group

• How should security teams govern non-human identities that have persistent access?
• How should security teams govern API keys used for generative AI access?
• How should manufacturers govern access in a digital factory?
• What breaks when organisations rely only on periodic access reviews?