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Data disk Bitlocker recovery key gone after computer re-installation

Pavel yannara Mirochnitchenko 12,386 Reputation points MVP
2024-03-24T11:24:57.45+00:00

I have desktop workstation with extra physical data disk drive encrypted with bitlocker. I changed OS disk for bigger one, updated bios and was about to re-install OS anyway. After BIOS upgrade, User Account for M356 services stopped working on existing OS but it was okay because I was going to re-install Windows 11. With old confuguration, I had computer account renamed from beginning via Intune manually and I had use it for 1,5 year. I do remember this old computer account.

Now, I installed same hardware with newer bios, enrolled the computer to Intune with DESKTOP-XXXXXX name and later again renamed it to different, new name than before. Later I started to unlock the Data disk with bitlocker recovery key and I found out that OLD COMPUTER ACCOUNT disappeared from Entra ID and Intune by itself. How this this is possible????

I found old (LBB450MA) account in Defender for Endpoint, and discovered that old and new (LB123456) account have same GUID:

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Microsoft Intune Security
Microsoft Intune Security
Microsoft Intune: A Microsoft cloud-based management solution that offers mobile device management, mobile application management, and PC management capabilities.Security: The precautions taken to guard against crime, attack, sabotage, espionage, or another threat.
370 questions
Microsoft Intune
Microsoft Intune
A Microsoft cloud-based management solution that offers mobile device management, mobile application management, and PC management capabilities.
4,643 questions
Microsoft Entra ID
Microsoft Entra ID
A Microsoft Entra identity service that provides identity management and access control capabilities. Replaces Azure Active Directory.
20,280 questions
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  1. Pavel yannara Mirochnitchenko 12,386 Reputation points MVP
    2024-03-24T17:50:30.54+00:00

    So I discovered that new computer account has actually also old bitlocker recovery keys, which is funny that old bitlocker keys are created in 2022 but account itself is created in 2024.