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Intune & Device Management

Intune app install fails with 0x87D300C9 (unmonitored process timeout)

0x87D300C9

A packaged Windows app pushed from Intune sits on 'Installing' for ages and then fails with a timeout error about an unmonitored process.

What you’re seeing

  • Company Portal or the Intune admin center shows the app as 'Installing' for an hour or more.
  • The install eventually fails with error 0x87D300C9 and a message about an unmonitored process timing out.
  • The app may actually be installed on the device even though Intune reports a failure.
  • Other apps from Intune install normally on the same device.

Common causes

Every environment is different, but these are the causes our engineers find most often:

  • The packaged Win32 installer launches a second process and exits, leaving a child process Intune cannot track.
  • The installer is waiting for user input, such as a license prompt, that nobody can see in the background.
  • The detection rule does not match what the installer actually leaves on the device, so Intune never sees success.
  • The install command needs a reboot or a prerequisite, and it hangs until the timeout.
  • The installer runs in the wrong context, such as user versus system, and cannot complete.

Why it matters

When Intune cannot install business apps, staff are left without the tools they need, or IT ends up installing them by hand. Reports that falsely show failures make it hard to know which devices are actually set up. For new laptops, a stuck app can also delay Autopilot and the whole onboarding process. Over time, unreliable app deployment erodes the value of having device management in the first place.

How AskTechGurus fixes it

Skip the trial and error. A certified engineer works on your actual system, finds the root cause, and fixes it properly.

Tell us what’s happening

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Fixed and verified with you

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Pay only when it’s resolved

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Frequently asked questions

Why does it say failed when the app is installed?

Intune decides success by checking a detection rule after the installer finishes. If that rule does not match the installed app, Intune reports failure even though the software is there.

Is the app itself the problem?

Usually not. The packaging, command line or detection rule is more often the issue than the software.

Can AskTechGurus package our app properly?

Yes. A certified US engineer can review the app package and its Intune settings through a remote secure session, starting at $99, and you pay only when the app deploys successfully.

Still stuck? Let a pro take it from here.

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