One of the most common mistakes I see is treating Intune as if it owns the entire device lifecycle. It doesn’t – and that distinction matters more than most people realize when they’re starting out.
Intune does not authenticate users. It does not issue tokens. It does not decide whether someone gets access to a resource. Those responsibilities live elsewhere, and understanding where the boundaries are is foundational to building an environment that actually behaves the way you expect.
Microsoft Entra ID establishes identity. Conditional Access enforces access decisions. Defender evaluates threat and risk signals. Intune contributes posture. Each layer has a defined role, and none of them replaces the others.
Intune’s primary responsibility is to define configuration intent and evaluate whether a device meets defined requirements. It is not a standalone enforcement engine.
It can require encryption. It can enforce certain settings. It can deploy applications. It can define compliance rules. But when a device is marked compliant, Intune is not granting access – it is providing a signal. Conditional Access consumes that signal and makes a decision based on it. If Conditional Access isn’t configured correctly, Intune compliance by itself does nothing to restrict access. The signal exists, but nothing is acting on it.
The same applies to security posture. Defender identifies threat state. Intune can require Defender to be active as part of compliance. But Intune does not analyze threat telemetry – it depends on that signal being accurate and present. If Defender isn’t reporting, Intune doesn’t compensate.
This layered model is intentional. Identity is established first. Device posture is evaluated second. Access enforcement happens after that. When those responsibilities get blended together conceptually, troubleshooting becomes genuinely confusing. Administrators start looking in Intune for authentication problems. They look in device configuration for access denials that are actually Conditional Access decisions. They expect Intune to block something that it only reports on.
Design improves significantly when each layer is given a clear role and held to it.
Intune manages configuration and posture. Entra ID establishes identity. Conditional Access enforces policy. Defender informs risk. Keeping those responsibilities distinct – not just conceptually, but in how you design and troubleshoot – is what makes the environment readable when something goes wrong.
Understanding that dependency early also prevents over-design in the wrong place and under-design in the places that actually enforce control. Intune is powerful. It is not complete by itself. That clarity becomes especially important once we move into enrollment and provisioning – because device management only makes sense when it’s positioned correctly inside the larger identity and access system.
Intune Deployment Guide · Phase 1: Foundations
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