Hello,
Thank you for posting in Microsoft Community forum.
Based on the description, I understand your question is related to unlock Bitlocker key.
Try this command:
manage-bde -unlock c: -recoverypassword <recovery password>
Generally, we can refer to the following path to check the BitLocker recovery key: Finding your BitLocker recovery key in Windows - Microsoft Support
If you are unable to locate a correct required BitLocker recovery key, I am afraid we will have to rebuild the machine.
Best regards,
Molly