How should organisations govern permissions when moving from Active Directory to Microsoft Entra ID in a hybrid identity model?

Hybrid identity changes the permission model, not just the directory

Moving from Active Directory to microsoft entra id changes how permissions are granted, approved, and reviewed. The main risk is treating the new platform as a simple migration target when it is actually a different control plane. In practice, governance has to cover human roles, app permissions, guest access, and third-party integrations together, because those paths now shape effective access.

That means organisations should separate directory hygiene from permission governance. A clean tenant still becomes over-permissive if app consent is unmanaged, guest invitations are loose, or service permissions are not owned and reviewed. The right baseline is to define who can approve, who can request, and which permissions are acceptable for each service or integration.

Hybrid identity also changes the ownership problem. Some access decisions remain in Active Directory, some move to Entra ID, and some are shared across both. Governance breaks down when teams assume one side will “inherit” the rules of the other without explicit mapping for roles, applications, and administrative boundaries.

How to govern app consent, guest access, and third-party access

Start with an inventory of the access paths that matter: role assignments, app registrations, consented permissions, guest users, federated connections, and third-party applications. That inventory should be tied to business ownership, because permission reviews fail when no one is accountable for deciding whether the access is still justified. This is especially important for cloud apps that may look routine but have broad directory or mailbox reach.

For hybrid identity governance, approval rules should be explicit. Restrict who can approve new apps, require review before consent is granted, and document which permission scopes are allowed by default versus which need elevated approval. If a service can read directory data, send mail, or act on behalf of users, it should be treated as a governed privilege, not a convenience setting.

Guest access and third-party integrations need the same discipline. External users and vendor connections often become the easiest way to accumulate unmanaged privilege because they are created for a project and left in place. The practical control is a time-bounded review cycle that confirms the access path, the sponsor, and the current business need.

Where organisations are also handling app-to-app or service access, the same principle applies to identity lifecycle management: issue only the permissions the service needs, revoke what is no longer used, and avoid reusing broad permissions across multiple integrations. The governance question is not whether the access works, but whether it is still justified and constrained.

What good governance looks like in a hybrid Microsoft identity stack

Good governance creates a single decision model for permissions even when the directory is hybrid. That usually means one policy for approval, one process for review, and one owner for each access path, instead of separate habits in Active Directory and Entra ID. It also means separating administrative control from application control so that directory admins do not become the default approvers for business access.

A useful operating rule is to review permissions at the point of grant and again at recertification. Grant-time controls prevent accidental overreach; periodic reviews catch drift, stale integrations, and permissions that became unnecessary after a project changed. In hybrid environments, that second review is often where orphaned app registrations and forgotten guest relationships surface.

When access reaches beyond the tenant, use a stronger standard for third-party trust. The permission model should answer three questions: who owns the integration, what exactly can it do, and how will the organisation know when that answer has changed. If those questions cannot be answered quickly, the permission is too loosely governed.

For deeper identity governance context, the control challenge is closely related to overprivilege, visibility gaps, and unmanaged credentials. Those problems do not disappear in a hybrid model, they become easier to miss because the same access can be delivered through different paths.

Risk and Threat Considerations

Hybrid identity expands the number of places where privilege can accumulate, which increases the chance of unauthorized access through app consent, guest sprawl, stale integrations, or reused service permissions. The security issue is not only misconfiguration, but also the persistence of access that no one actively owns.

Failure mechanism: Permissions migrate faster than governance. Teams move users and apps to Entra ID, but approval rules, review cadence, and ownership models remain fragmented across old and new control planes, leaving effective access broader than intended.

Impact: Excessive or unreviewed access can enable data exposure, tenant abuse, privileged actions by third-party tools, and long-lived permission drift that is difficult to detect until after a compromise or audit finding.

Practitioner Guidance

What to verify: Before treating a permission as acceptable, verify who approved it, who owns the app or integration, what exact scope was granted, and whether the access is still needed for the current business process. If the answer depends on tribal knowledge, the governance model is incomplete.

Decision rule: If an access path can reach user data, directory data, mail, or administrative APIs, require explicit approval and periodic recertification. If the access is only for convenience or legacy compatibility, challenge whether it should exist at all.

Practitioner takeaway: In hybrid identity, the safest posture is to govern permissions by business justification and ownership, not by directory boundary. Active Directory and Entra ID are different implementations of the same trust problem, so the controls must follow the privilege, not the platform.

Related resources from NHI Mgmt Group

• How should teams govern hybrid Active Directory and Entra ID at the same time?
• When should organisations keep Active Directory instead of moving fully to Entra ID?
• Who should be accountable for hybrid identity resilience across Active Directory, Entra ID, Okta, and Ping?
• Why do organisations need to treat Microsoft Entra ID security differently from on-premises Active Directory?