Hi Bin Xu,
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I can understand why you're frustrated. Being locked out of your laptop for a month, contacting support multiple times without a resolution, and then noticing the device is no longer listed in your Microsoft account would be concerning for anyone.
That said, I must note in advance that Microsoft Q&A is just a public community forum. Contributors here are fellow users; we can help provide guidance and explain how BitLocker works. But no one has the ability to review support cases, investigate account activity, or contact Microsoft's teams on your behalf for escalation.
Regarding the BitLocker issue, there are also some realistic limitations I think you should know of. While Microsoft Support may be able to review the history of your support case and investigate account-related concerns, the outcome of your BitLocker recovery situation might remain the same:
- Even if Microsoft investigates the circumstances surrounding the missing BitLocker recovery key, the critical issue remains whether the recovery key was ever backed up. If it was not, neither a Microsoft Support agent nor Microsoft itself can recover information that was never stored after the fact.
- Similarly, Microsoft may be able to review available records and explain what information they can verify, but there may be limits to what can be determined from historical account and support data.
If the recovery key wasn't found in any of your Microsoft accounts, work or school accounts, printed copy, USB drive, or other backup location, Microsoft cannot retrieve, recreate the key, or unlock your device. The only remaining option is reset or reinstall Windows, which unfortunately will erase the encrypted data.
I know that is probably not the answer you were hoping for. However, I think it is important to be transparent: even if a supervisor reviews the case or Microsoft investigates what happened, that does not necessarily mean the recovery key can be recovered.
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