The BitLocker recovery key ID is only shown on the BitLocker recovery screen or wherever the recovery key was backed up. If the company did not enable BitLocker or did not escrow the key, there is no separate way to “generate” or “look up” a key ID.
To find the recovery key ID when BitLocker is already asking for it:
- Start the device and wait for the blue BitLocker recovery screen.
- On that screen, note the first 8 digits of the Recovery key ID shown. That is the key ID used to match against stored recovery keys.
To locate the corresponding recovery key (if it was backed up):
- Check the Microsoft account that might have been used when BitLocker was turned on by going to https://aka.ms/myrecoverykey from another device and matching the key ID.
- If the device was ever joined to a work or school account, sign in with that account at https://aka.ms/aadrecoverykey, go to Devices, select the device, and choose View BitLocker Keys, then match by key ID.
- Check for a printed copy of the key or a USB flash drive where the key might have been saved as a text file.
- If the device is managed by an organization, contact the IT department to see if they have the recovery key.
If the recovery key cannot be found in any of these locations and the changes that triggered recovery cannot be undone, the only remaining option is to reset the device using Windows recovery options, which removes all files.
References: