Bitlocker key

Microsoft Support cannot retrieve or recreate a missing BitLocker recovery key, and the first eight digits shown on the recovery screen are only a recovery key ID, not the beginning of the 48-digit key.^1^

The key ID identifies the correct saved key when several keys exist. It cannot be used by Microsoft to calculate or search for the remaining digits.

Check the remaining possible locations

Since the key is not listed under the Microsoft account you checked:

1. Check other Microsoft accounts previously used on the laptop.
   • This includes an account used during the laptop’s original setup.
   • If another person, retailer, or previous owner configured Windows or enabled encryption, the key might be in that person’s account.
   • On Windows 11 version 24H2, the recovery screen may display a hint identifying the associated Microsoft account.^1^
2. If any work or school account was connected, check that account.
   • From another device, open https://aka.ms/aadrecoverykey.
   • Sign in with the relevant work or school account.
   • Select Devices, expand the laptop, and select View BitLocker Keys.
   • Match the displayed key ID with the ID on the locked laptop.
   • If the key is not available to you, contact that organization’s IT department and give them the complete key ID.^1^
3. Look for a locally saved copy.
   • Check USB drives for a BitLocker text file or recovery-key file.
   • Search cloud storage, external drives, and backups for “BitLocker Recovery Key.”
   • Check printed documents or PDFs created when the device was configured.
   • Follow any location hint displayed on the BitLocker screen; BitLocker records where a key was successfully backed up and can use that information to show a recovery hint.^2^

If no copy can be found

There is no supported bypass for BitLocker encryption, and contacting consumer Microsoft Support with the key ID will not allow them to reconstruct the 48-digit recovery key. If none of the storage locations contains it, the encrypted files cannot be recovered through the normal BitLocker recovery process.

The remaining option is to reset or reinstall Windows, which removes the encrypted files, applications, and settings from the device.^1^ Windows can also be reinstalled using installation media created on another working computer.^3^

Do not reset or reinstall until every possible account, employer or school directory, USB drive, printout, and backup has been checked, because the reset will permanently remove the files on the encrypted drive.

References

1. Find your BitLocker recovery key | Microsoft Support
2. BitLocker preboot recovery screen
3. Recovery options in Windows | Microsoft Support