BitLocker was activated by someone and during the PC activation time it prompts the user to save/store the key in a safe place.
** If this is a company owned asset/tablet, you should turn to your company's IT support guys and they should be able to provide you with the recovery key
** If this is your own personal device, and if you are not aware of Bitlocker key, most probably you use a slightly different BitLocker version for certain PCs and tablets known as Device encryption. Probably your key is stored in Microsoft OneDrive with your Microsoft account here :
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