Hello Hen Thaly,
thank you for posting on the Microsoft Community Forums.
Sorry to hear that there is an issue with your BitLocker password. Unfortunately, Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key. It means you will need to find it out by yourself.
You can follow the steps in Finding your BitLocker recovery key in Windows - Microsoft Support.
Important:
- If you are unable to locate the BitLocker recovery key and can't revert any configuration change that might have caused it to be required, you’ll need to reset your device using one of the Windows recovery options. Resetting your device will remove all of your files.
- Microsoft support is unable to provide, or recreate, a lost BitLocker recovery key.
Best regards,
Lei