Data disk Bitlocker recovery key gone after computer re-installation

Question

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:

Answer 1

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.