If the BitLocker password for a computer is lost, it can be reset using the Recovery Password key from the computer's properties in Active Directory. Copy the password key and provide it to the end user.
To view and copy the recovery password:
Launch the Delegation and Configuration console, and expand the tree view structure.
In the Account and Resource Management node, navigate to All My Managed Objects > Domain > Computers.
In the computers list, right-click the required computer, and select Properties.
Click the BitLocker Recovery Password tab to view the BitLocker recovery password.
Right-click the BitLocker recovery password, click Copy, and then paste the text onto required text file or spreadsheet.