totally forget ms account and get bitlocker

There is no alternative way to retrieve a BitLocker recovery key if the backed-up key and the associated account cannot be found.

Key points based on the documented behavior:

1. BitLocker recovery keys are not stored or retrievable by Microsoft Support
   • Microsoft Support does not have the ability to retrieve, provide, or recreate a lost BitLocker recovery key, even with proof of purchase, device serial number, or the BitLocker Key ID.
   • The recovery key must come from one of the locations where it was originally backed up.
2. Where the BitLocker recovery key might be
   • Microsoft account: If BitLocker was turned on using a personal Microsoft account, the key is typically backed up to that account and can be viewed at the recovery key page: see the guidance in “Find your BitLocker recovery key”.
   • Work or school account / Microsoft Entra ID: If the device was ever joined to an organization (work or school), the key may be stored in that organization’s tenant. In that case, only the organization’s IT/helpdesk can retrieve it by looking up the device and recovery key ID.
   • Other locations: Printed copy, USB flash drive, or other backup created when BitLocker was enabled.
3. What to try if the Microsoft account is forgotten
   • Systematically check all possible Microsoft accounts (personal and work/school) at the recovery key page described in “Find your BitLocker recovery key”.
   • If the device was managed by an organization, contact that organization’s IT department and provide the recovery key ID and device details so they can look up the key in Microsoft Entra ID or Active Directory, as described in the BitLocker recovery process.
4. When the key cannot be found
   • If none of the documented locations (Microsoft account, work/school account, printed/USB backup, organizational backup) contain the key, there is no supported method to unlock the encrypted drive.
   • In that case, the only remaining option is to reset or reimage the device, which removes all files on the encrypted drive. This is consistent with the guidance that if the BitLocker recovery key cannot be found and the changes that triggered recovery cannot be undone, the device must be reset using Windows recovery options.
5. Role of Microsoft Support
   • Microsoft Support cannot look up or reconstruct the BitLocker key using the BitLocker Key ID, device serial number, or proof of purchase.
   • For organization-managed devices, only the organization’s IT (helpdesk/admins) can retrieve keys they previously configured to back up to Microsoft Entra ID or Active Directory.

If the original Microsoft account or any organizational account that holds the key cannot be identified, and no printed/USB backup exists, the encrypted data cannot be recovered.

References:

• Find your BitLocker recovery key
• Back Up Your BitLocker Recovery Key
• BitLocker recovery process
• Windows devices for home users, businesses, and schools with Microsoft-managed updates
• I WANT TO FIND MY BITLOCKER RECOVERY KEY FOR MY COMPUTER - Microsoft Q&A
• Surface Pro 3 blocked - Microsoft Q&A