MD-102 Manage applications Practice Question
You are deploying a line-of-business (LOB) app to iOS devices using Microsoft Intune. The app is signed with an enterprise certificate. Users report that the app installs but crashes immediately on launch. What is the most likely cause?
⚠ Common exam trap
Watch out — candidates often confuse 'signed' with 'trusted' — the app is signed, but iOS requires explicit trust of the enterprise certificate, which is a separate step often overlooked in MDM deployments.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The enterprise developer certificate is not trusted on the device.
The most likely cause is that the enterprise developer certificate is not trusted on the device. iOS requires that enterprise-signed apps have their root certificate manually trusted via a profile (e.g., MDM or manual installation) before the app can run. Without this trust, iOS blocks the app from executing, causing an immediate crash on launch.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The Intune company portal app is not installed.
Why it's wrong here
Company Portal is needed for enrolment and delivering store apps, but a line-of-business app already installed via Intune launches independently of it. Requiring Company Portal applies to conditional access or managed store app deployment scenarios, not to diagnosing why a signed LOB app terminates immediately on launch.
- ✗
The app is not signed.
Why it's wrong here
An unsigned iOS app cannot install at all — iOS rejects it during installation — so it could not appear on the device and then crash. Signing failures are the correct diagnosis when deployment itself fails with an installation error, whereas this app installs successfully and only fails at launch.
- ✗
The app requires a VPN connection.
Why it's wrong here
VPN requirement would cause network error, not immediate crash.
- ✓
The enterprise developer certificate is not trusted on the device.
Why this is correct
An untrusted enterprise signing certificate causes iOS to block code execution at launch, so the app installs but terminates immediately. Trusting the certificate under Settings > General > VPN & Device Management resolves this. This satisfies the stem's constraint: the app is enterprise-signed, and iOS enforces certificate trust before allowing the binary to run.
Go deeper
Related to this question
Learn chapter
Deploying Applications with Intune
Key term
Intune
Microsoft Intune is a cloud-based service that helps organizations manage their users' devices and applications, ensuring security and compliance without needing to own or control the physical hardware.
Key term
MDM
MDM stands for Mobile Device Management, a technology that allows IT administrators to securely manage, monitor, and enforce policies on mobile devices like smartphones and tablets from a central console.
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Same concept, more angles
1 more way this is tested on MD-102
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. You are troubleshooting an Intune deployment of a line-of-business (LOB) app for iOS. The app fails to install on some devices with error '0x87D13B9F'. Which THREE actions should you take to diagnose the issue?
hard- A.Check the Intune Service Health dashboard for service incidents
- ✓ B.Check if the device is supervised and that the app requires supervised mode
- C.Ensure that an app configuration policy is assigned to the device
- ✓ D.Verify that the app's provisioning profile has not expired
- ✓ E.Confirm that the device has sufficient storage space available
Why B: Error 0x87D13B9F on iOS LOB app installs typically indicates the app cannot be installed due to a device-side or app-package constraint, so option B is correct: some LOB apps (especially those using certain deployment features or managed configurations) require the iOS device to be supervised, and an unsupervised device will reject the install. Option D is correct because an expired or invalid embedded provisioning profile in the IPA causes iOS to refuse installation, producing this class of Intune install failure. Option E is correct because insufficient free storage on the device prevents the app payload from being written, which also surfaces as an install failure with this error code. Option A is not appropriate because a service-wide incident would affect all devices broadly and is not the targeted cause of a per-device 0x87D13B9F failure. Option C is not appropriate because app configuration policies apply settings to an already-installed app and do not block or cause the installation itself to fail.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This MD-102 practice question is part of Courseiva's free Microsoft certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MD-102 exam.