Block personally-owned devices

My last blog post just before a short vacation, is about using the differentiation between corporate-owned devices and personally-owned devices. The best scenario for this differentiation is preventing the MDM enrollment of personally-owned devices. In that scenario it’s still possible to use MAM-WE with personally-owned devices, as only the MDM enrollment will be blocked. In other words, it’s still possible to enable the end-users to securely access their corporate data on their personally-owned device. The ability to block personally-owned devices is introduced with Configuration Manager 1706 and was already available for a while in Microsoft Intune standalone. In this post I’ll walk through the configuration steps for Microsoft Intune hybrid and standalone. I’ll end this post with the end-user experience.

Configuration

Before starting with the configuration, it’s good to mention that Microsoft Intune hybrid and standalone classifies devices as personally-owned by default.

Microsoft Intune hybrid

The configuration for Microsoft Intune hybrid must be done by using the Configuration Manager administration console. At this moment Microsoft Intune hybrid only supports the restriction on personally-owned devices for Android and iOS. This can be configured by simply following the next steps.

1 Open the Configuration Manager administration console and navigate to Software Library > Overview > Cloud Services > Configure Platforms;
2 On the Home tab, click Configure Platforms > Android (3a) or iOS (3b) to open the Microsoft Intune Subscription Properties;
3a BlockPersonal_Android_HybridOn the General tab, select Block personally owned devices and click OK;
3b BlockPersonal_iOS_HybridOn the Enrollment Restrictions tab, select Block personally owned devices and click OK.

Note: To specify that a device is company-owned, add the IMEI or serial number to the Predeclared Devices list (as shown here), or enroll it using Apple DEP (iOS only).

Microsoft Intune standalone

The configuration for Microsoft Intune standalone must be done by using the Azure portal. At this moment Microsoft Intune standalone supports the restriction on personally-owned devices for Android, iOS and macOS. This can be configured by simply following the next steps.

1 Open the Azure portal and navigate to Intune > Device enrollment > Enrollment restrictions to open the Device enrollment – Enrollment restrictions blade;
2 On the Device enrollment – Enrollment restrictions blade, select Default in the Device Type Restrictions section, to open the All Users blade;
3 On the All Users blade, select Platform Configurations to open the All Users – Platform Configurations blade;
4

BlockPersonal_StandaloneOn the All Users – Platform Configurations blade, select Block, in the PERSONALLY OWNED column, for the platforms of which personal-owned devices must be blocked and click Save.

Note: To specify that a device is company-owned, ad the IMEI or serial number to the Predeclared Devices list (as shown here), or enroll it using Apple DEP (iOS only)..

End-user experience

Now let’s end this post by looking at the end-user experience for Android and iOS devices.

Screenshot_20170816-201942Android: Let’s walk through the steps, on an Android device, that the end-user needs to perform before the end-user will actually be told that it’s not allowed.

  • Open the Microsoft Intune Company Portal app and sign in;
  • On the Company Access Setup page, tap Begin;
  • On the Why enroll your device? page, tap Continue;
  • On the We care about your privacy page, tap Continue;
  • On the What comes next page, tap Enroll;
  • On the Activate device administrator? page, tap Activate;

Now a clear Couldn’t enroll your device message will show (as shown on the right). That message clearly mentions that the end-user is not authorized to enroll this device.

IMG_0112iOS: Let’s walk through the steps, on an iOS device, that the end-user needs to perform before the end-user will actually notice that it’s not allowed.

  • Open the Microsoft Intune Company Portal app and sign in;
  • On the Company Access Setup page, tap Begin;
  • On the Why enroll your device? page, tap Continue;
  • On the We care about your privacy page, tap Continue;
  • On the What comes next page, tap Enroll;
  • On the Install Profile page, tap Install;
  • On the dialog box, tap Install;

Now a terrible Profile Installation Failed message will show (as shown on the right). That message mentions that a connection to the server could not be established. This is ugly, but is currently the expected behavior.

More information

For more information about blocking personally-owned devices and how it can be configured via Microsoft Intune hybrid and standalone, please refer to the following articles:

2 thoughts on “Block personally-owned devices

  1. Hi Peter is this possible?
    I have a scenario that I believe is common at many companies.
    User with multiple devices, some corporate some personal.

    When users open outlook it asks.
    BYOD personal devices to register their phones not enroll
    CYOD corporate devices should enroll

    I have turned on App Protection policy and this works well it forces the user on both personal and personal devices to use Outlook otherwise they cannot access email.

    But I cannot make Intune automatically —— force a corporate device to enroll and the same user on a personal device to Register not enroll.

    I have tried importing devices IMEI or serial number, I thought this would then once the user uses oulook it would recognize it’s a corp device and make them enroll, it does not it is still down to the user to Enroll themselves by their own choice.

    I have also tried blocking personal devices from enrolling this works but still no way of telling a corporated device it must enrol and a personal device it only needs to register.

    My real question is this possible? for a user to have 2 devices one corporate that when he first uses outlook it say Corporate device please enroll.
    Then the same user using a personal device it just asks to register only?

    I have turned on conditional access but then that asks all users to enroll no matter which device.

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