Intune and Defender Endpoint Control

This guide is meant for the real review, not the polished meeting version. The point is to decide whether Intune and Defender are genuinely controlling the estate, or whether the tenant just looks busy.

Quick answer

Check endpoint control in this order: device inventory, Intune enrolment, Defender onboarding, compliance policy results, Conditional Access dependency, local admin exposure, patch status, alert workflow and exception ownership.

Who this affects

This affects Microsoft 365 tenants where Intune and Defender are meant to support Cyber Essentials Plus, customer due diligence, insurer evidence, Conditional Access or a move away from local admin rights.

It matters most when remote devices, contractor laptops, unmanaged personal devices or old Autopilot pilots are still present.

What usually goes wrong

Failure mode	What it looks like	Why it matters
Partial coverage	Devices exist in one inventory but not another	Reports overstate control
Weak compliance	Access depends on compliant device before compliance is reliable	Conditional Access trust is false
Defender gaps	Devices are enrolled but not onboarded or healthy	Incidents and risk signals are missing
Policy conflicts	Baselines, settings catalog and endpoint security overlap	Devices behave unpredictably
Local admin drift	Exceptions exist without owner or expiry	Least privilege decays

What to check first

Check	Useful evidence
Intune enrolled device count	Intune device report
Defender onboarding	Defender device inventory and health state
Compliance result	Compliance report with failure reasons
Conditional Access dependency	Policies requiring compliant or hybrid joined devices
Local admin exposure	Account protection, EPM or exception review
Unsupported operating systems	Device inventory and remediation list
Patch evidence	Update compliance or management report

Start with coverage. If device coverage is partial, every later metric is weaker than it looks.

Evidence to collect

Keep evidence that a non-specialist can read later.

• Current device coverage numbers.
• Compliance posture by operating system.
• Devices above the accepted risk threshold.
• Active local admin exceptions.
• Recent high-severity incidents and closure state.
• Policy conflicts and assignment failures.
• Named owner for each major endpoint control area.

If gathering that evidence turns into a scavenger hunt, the endpoint model needs more work.

Fix path

1. Reconcile device inventory across Intune, Defender and asset records.
2. Put unknown, stale or duplicate devices into a remediation queue.
3. Confirm Defender onboarding and health before relying on Defender risk.
4. Tighten compliance policies and map them to Conditional Access.
5. Remove duplicate or conflicting policy assignments.
6. Replace standing local admin with EPM or named exceptions where possible.
7. Export a repeatable monthly evidence pack.

Common mistakes

The common mistake is assuming enrolment equals control. A device can be enrolled but stale, unhealthy, non-compliant or outside the policy that matters.

Another mistake is layering baselines and custom policy without a conflict map. When settings overlap, support teams lose trust in the platform.

Related route

For the matching service path, use Intune and Defender endpoint control.

References

• Onboard devices and configure Microsoft Defender for Endpoint capabilities
• Windows compliance settings in Microsoft Intune
• Manage device security with endpoint security policies in Microsoft Intune