Why quarterly compliance CSV reviews fail: moving to event-driven access certification

Why the quarterly snapshot misses the decision

In a hypothetical quarterly campaign, a manager receives 500 access rows every 90 days. The operational weakness is not CSV formatting: it is asking one person to reconstruct the business purpose of every entitlement from a snapshot. A team transfer or completed project can invalidate yesterday's justification without appearing clearly in that export. Treat blanket approval as a design warning, not evidence of misconduct. Microsoft documents excessive access as a potential cause of compromises and audit findings; this campaign scenario is illustrative.

An event-driven model should supplement, rather than automatically replace, required periodic certification. Recommend opening a focused review when a relevant business fact changes, while retaining scheduled checks for missed events and policy exceptions. Microsoft Entra documents recurring reviews at weekly, monthly, quarterly or annual frequencies; the supplied documentation does not establish native triggers for every business event. NIST describes authentication and authorization before a resource session. Certification helps reassess entitlement justification, but it does not substitute for those session-level checks.

Evidence: What are access reviews?, Zero Trust Architecture

Define the event, entitlement and accountable owner

First, inventory the access being certified and identify its business owner, granting mechanism and removal path. Microsoft Entra reviews cover group memberships, enterprise application access and role assignments, with review locations and reviewer options varying by resource type. Do not assume a manager understands every application permission. As a recommended design, route decisions to someone who can explain the resource's purpose, and provide the affected entitlement, original justification and changed circumstance. Establish this mapping before connecting event feeds to review workflows.

Next, define role-change and project-completion signals with the teams responsible for those records. In a hypothetical workflow, an approved department transfer opens a review of access associated with the previous department; project closure opens a review of project-specific grants. These are proposed integrations, not documented automatic Entra behaviour. Avoid treating either event as unconditional proof that access must disappear. Microsoft explicitly describes cases where someone leaving a group still needs access to train a replacement. Require a documented, time-bounded exception when recommending retention.

Evidence: What are access reviews?

Use inactivity as a prompt, not a verdict

For inactivity, distinguish the documented review capability from your proposed detection logic. Microsoft states that creating reviews on inactive users requires a Microsoft Entra ID Governance license. The supplied evidence does not define an inactivity threshold or establish which activity signals prove business need. Recommend documenting the chosen signal, observation period and exclusions before using it to open a review. Ask whether missing activity reflects unused access, incomplete telemetry or occasional duties; inactivity should initiate investigation rather than function as an automatic removal guarantee.

Then give the reviewer a focused decision: retain access with a current justification, deny it, or request clarification. Microsoft documents approval and denial through its review interface, supported by recommendations; those recommendations should inform, not replace, accountable judgment. For guest access to sensitive group content, involve the group owner. Microsoft distinguishes employee lifecycle automation based on HR data from invited guests, whose continued business need requires owner confirmation. Recommend escalating unresolved decisions to a named resource owner instead of allowing silence to become approval.

Evidence: What are access reviews?

Close the loop and retain the periodic safety net

Finally, separate the certification decision from verified enforcement. As an implementation recommendation, record the triggering event, affected grant, reviewer, justification and intended action, then confirm the resulting entitlement state in the system that controls access. A denied row should not be treated as proof of removal without that check. Test the workflow against repeated events, missing owners and temporary exceptions before expanding it. Record unresolved enforcement failures separately from completed reviews so that campaign completion does not conceal access that remains in place.

Keep recurring reviews for business-critical access, privileged assignments and policy exceptions, all identified in Microsoft's guidance. Before implementation, validate licensing: access reviews generally require Microsoft Entra ID Governance or Microsoft Entra Suite, while some capabilities may operate with P2; inactive-user reviews specifically require Governance. As a recommended operating check, examine whether events reach the correct reviewer, exceptions receive follow-up and denials produce verified changes. The objective is better-supported decisions between scheduled campaigns, not a claim that automation guarantees appropriate access.

Evidence: What are access reviews?