Intune Best Practices –

The Six Most Common Mistakes

1. Skipping Conditional Access Setup

Conditional Access is the cornerstone of modern security. Without it, even a jailbroken iPhone with stolen credentials could waltz into your apps.

Pro tip: If you’re nervous about lockouts, start in report-only mode. You’ll see what would happen before you enforce it. That way, there’s no excuse to leave the doors wide open.

2. Treating Policies as “One-and-Done”

Too many teams create policies during deployment and never revisit them. The business grows, new apps appear, hardware changes, but the policies stay frozen in time.

Advice: Treat policies like patching. Do quarterly audits and adjust for new realities. Document everything. A bloated, outdated policy set is just as dangerous as no policy at all.

3. Firewall Misconfigurations

One of the more frustrating problems: Intune “stops working”, but the issue isn’t Intune. It’s the firewall quietly blocking traffic after a firmware update.

What works: Maintain a living checklist of Intune’s required ports and IPs. Share it with your firewall team. Subscribe to Microsoft’s service tag updates so you’re not caught off guard when endpoints change.

4. Weak or Misconfigured MFA

We still see admin accounts protected by SMS-based MFA. It’s better than nothing, but it’s also easy to phish. Worse, legacy portals sometimes get overlooked.

Strong stance: Use phishing-resistant MFA like Microsoft Authenticator or FIDO2 keys. Don’t forget your break-glass accounts, those need the tightest controls of all.

5. Too Many Admin Rights

In the early days of deployment, it’s tempting to give broad admin rights “just to get things working.” Fast forward a few months, and suddenly half the IT team has Global Admin. That’s a recipe for privilege escalation.

Fix it fast: Embrace role-based access control (RBAC) and Privileged Identity Management (PIM). Global Admin should be temporary and rare, not the default.

6. Compliance Policies That Don’t Actually Work

Imagine: your compliance dashboard says everything’s fine, but devices aren’t really compliant. Maybe BitLocker didn’t enable properly, or a required OS version was never enforced.

Best practice: Test with pilot groups before you go wide. Check enforcement logs, and communicate clearly with end users about what “compliance” means. Otherwise, you’ll get pushback when their devices suddenly stop working.

Best Practices from the Start

The good news? Every one of these mistakes is avoidable if you take a best-practices-first approach.

Define Conditional Access from Day 1

Only allow access from compliant devices. Validate in report-only mode before enforcing.

Schedule Policy Reviews Like Patch Cycles

Quarterly audits keep Intune aligned with reality. Document and prune to avoid sprawl.

Maintain an Approved Firewall Rule Set

Keep ports, IPs, and services up-to-date. Publish them. Circulate them. Monitor changes.

Enforce MFA with Strong Fallbacks

Protect admin accounts with phishing-resistant MFA. Lock down break-glass accounts with extra care.

Use Role-Based Access, Not Blanket Rights

Assign permissions by job function. Make Global Admin temporary via JIT elevation.

Compliance Policies with Remediation in Mind

Don’t just detect issues, configure automatic remediation (like alerts or device isolation) before going nuclear with outright blocks.

Intune is an adaptive security control enabler. This platform helps maintain compliance by hardening devices, enforcing user policies, and protecting sensitive data.