Why does enrolling one PC in Intune Unenroll others?

Covalt, Jonathan G 141 Reputation points

I have 3 on-premise computers that are all configured as hybrid devices in Azure AD (let's call them PC1, PC2, and PC3). I've confirmed all 3 show up correctly in Azure, with different Azure device IDs.

When attempting to enroll these 3 machines into Intune, however, if I enroll 1 of them, it works fine, but enrolling either of the other 2 makes the first one vanish from Intune and the new one show up instead. I have no idea why this would be happening, and there are literally hundreds of other computers enrolled without issue, it's just these 3 machines that have this issue.

Has anyone encountered this before and know how to resolve the issue?

Microsoft Intune Enrollment
Microsoft Intune Enrollment
Microsoft Intune: A Microsoft cloud-based management solution that offers mobile device management, mobile application management, and PC management capabilities.Enrollment: The process of requesting, receiving, and installing a certificate.
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  1. Crystal-MSFT 42,306 Reputation points Microsoft Vendor

    @Covalt, Jonathan G, Thanks for posting in Q&A.

    From your description, I know the previous enrolled device will disappear from Intune after we enroll another. Based on my researching, if the devices share the same serial number. the issue can occur. Please check if the two devices are with the same serial number.

    To check the serial number, you can run the following command in command prompt:

    wmic bios get serialnumber

    Please check the above information and if there's any update, feel free to let us know.

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