Bitlocker uses the computer's chip to store encryption keys and does not rely on individual user credentials. security certificate powershell encrypting file system (efs) trusted platform module (tpm)

Bitlocker uses the computer's security certificate chip to store encryption keys and does not rely on individual user credentials. 
 The encryption certificates are stored in the Windows Certificate database.
 The encryption key is used to scramble the contents of the file, it's also encrypted with a personal file encryption certificate, the file's encryption key is stored along with the file.

Call then make sure to check your email

Ithink the answer is letter d