How can I find Bitlocker External Key File location?

My Windows 8.1 PC includes a system drive and data drives. All the drivers were encrypted using Bitlocker with the data drives set for autounlock. 
I recently decrypted the system drive (without decrypting the data drives) and reinstalled the OS, after which my data drives required the Bitlocker recovery key to unlock. 
However, I had "backed up" the recovery keys to my Microsoft account but now I can find only the recovery keys for the system drive. The recovery keys for the data drives cannot be found on my Microsoft account. 
I have tried to use the "manage-bde" command at the console to obtain the recovery password but I am only getting the Numerical Password ID and the External Key File Name. Can anyone provide advice on how I can retrieve the passwords or the
External Key File location?
Thanks.

Hi Ridgewood,
As my point of viewer, the BitLocker Automatic unlock volume is also protected by BitLocker Disk Encryption. The user encrypted information is stored in the registry and volume metadata. After a user unlocks the operating system volume, BitLocker uses the
encrypted information to unlock the data volume automatically.
After the reinstallation of the system, the encrypted information is lost and BitLocker can’t unlock the data volume automatically.
Every volume has own recovery key.
As mentioned in your post, the data drive require the recovery key to unlock.
I suggest you to double-check the OneDrive and try to find out where did you store the recovery key.
If you can’t find the recovery key, we can’t help you to decrypt the data volume.
Best regards,
Fangzhou CHEN
Fangzhou CHEN
TechNet Community Support

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