How to manually escrow bitlocker keys

List the key

1. Attach the drive and determine the drive letter assigned to the drive
2. Open up a comand window

cmd.exe

3. List the drive information. The specific items to look for is the "Numerical Password:" followed by "ID:" 

manage-bde -protectors -get F:
  

C:\Users\rollins>manage-bde -protectors -get F:
BitLocker Drive Encryption: Configuration Tool version 6.1.7601
Copyright (C) Microsoft Corporation. All rights reserved.

Volume F: [TOSHIBA EXT]
All Key Protectors

    Numerical Password:
      ID: {C2AABBCC-2AA8-4BBA-9CCD-BADDDDDDA766}
      Password:
        102267-544232-444529-451135-760125-478765-645074-712281  

    Password:
      ID: {1AB876sE-5A3B-4B9F-C3A0-BAA45789BC06}

    External Key:
      ID: {0AAF234C-0239-AB23-A2B4-AABB23CABA72}
      External Key File Name:
        0AAF234C-0239-AB23-A2B4-AABB23CABA72.BEK
      Automatic unlock enabled.

 
4. Run the manage-bde command to upload the keys. You will need to use the same drive letter as before. Locate the text "Numerical Password:" followed by "ID:" in the text above. The ID string is in bold. The curly-braces {} are included.

manage-bde -protectors -adbackup F: -id {C2AABBCC-2AA8-4BBA-9CCD-BADDDDDDA766}