Drive Locked with Bitlocker after Windows 11 upgrade

Occasional Visitor

End of last year, my laptop upgraded to Windows 11 on its own after I left it at night. But my second drive was unusable since it has been locked by the Bitlocker. I don't know if it is already pre-set before the upgrade. But before the upgrade, everything was ok. I dont have any key or anything. I have tried to check on Microsoft account yet, I am unable to find anything.

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