Hello Modi,
Thank you for posting question on Microsoft Windows Forum!
Well! The fact of the matter is that the 8-character Recovery Key ID shown on the BitLocker screen must match the corresponding 48-digit recovery key. A different key, even if it belongs to the same laptop, will not unlock the drive. There are a few options you can try to see if it might work.
- Try to check your personal Microsoft account. From another phone/PC, open Microsoft BitLocker Recovery Keys .Sign in with every personal Microsoft account you may have used on this laptop. Look at the first 8 characters of the Key ID and compare them with the ID on your BitLocker screen. It should be noted that if somebody else initially configured/encrypted the PC, the key may have been saved to their Microsoft account instead. For more information https://support.microsoft.com/en-us/windows/security/encryption/find-your-bitlocker-recovery-key
- Searching external drives, USB sticks, or cloud storage (OneDrive) for text files or PDFs containing "BitLocker Recovery Key" or matching the first 8 characters of the displayed Key ID.
- If the school managed the laptop with Intune, Configuration Manager, Active Directory, or Entra ID, the recovery information may have been escrowed centrally. When an organization manages BitLocker, the organization might hold the recovery key. Try to ask their IT department to search using the Recovery Key ID, rather than only searching by your student account. For more information https://support.microsoft.com/en-us/windows/security/encryption/bitlocker-overview
Hope the above information is helpful!