Some Microsoft account, which I have no idea, locked my hard drive with Bitlocker

[Nan Ye]

BitLocker suddenly locked my laptop/hard drive, which, I think, some Microsoft account activated. I have no idea which account performed the task, so I have no access to the BitLocker key. There is no way to reach Microsoft for help. What can I do?* Changed to a question* Original title: Some Microsoft account, which I have no idea, locked my hard driver

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