MD-102 Prepare infrastructure for devices Practice Question
You manage devices with Microsoft Intune. You need to deploy a line-of-business (LOB) app to iOS devices. The app is signed with an enterprise certificate. Some devices report installation failure with error code 0x87D13B9F. What is the most likely cause?
⚠ Common exam trap
Many exam-takers confuse a signing error (missing certificate trust) with a packaging error (unsigned app), but the error code 0x87D13B9F specifically points to trust, not signature absence.
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 signing certificate is not trusted on the device.
Error code 0x87D13B9F in Microsoft Intune typically indicates a signing certificate trust issue. Since the app is signed with an enterprise certificate, the device must have that certificate installed and trusted in its trusted root store. If the certificate is not trusted, iOS will reject the installation, producing this specific error.
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 app package is not signed.
Why it's wrong here
The question states the app is signed; if it weren't, the error would be different.
- ✗
The app is not available in the Apple App Store.
Why it's wrong here
LOB apps are deployed directly, not through the App Store.
- ✓
The enterprise signing certificate is not trusted on the device.
Why this is correct
Error 0x87D13B9F indicates that the app's signing certificate is not trusted, often because the certificate profile is missing.
- ✗
The device does not have enough storage space.
Why it's wrong here
Storage errors have different codes, e.g., 0x80070070.
Go deeper
Related to this question
Learn chapter
Introduction to Endpoint Management in Microsoft 365
Key term
Microsoft Intune
Microsoft Intune is a cloud-based service that helps organizations manage employee devices, apps, and security policies without needing to own or control the physical hardware.
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.
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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.