Hello, thank you for reaching out to Microsoft Q&A.
Sign in with your Microsoft account here to locate your BitLocker recovery key.
https://account.microsoft.com/devices/recoverykey
If you're unable to locate the key, try signing in with all the Microsoft accounts you remember, as the key might be linked to one of them. If you've added a Work or School account to the device, the key could also be associated with that account. In that case, you can contact your IT administrator to check if the key can be found there.
If you're unable to locate the BitLocker recovery key, you will have to create Windows 11 USB Installation media and use it to Reinstall Windows. However, this process will completely wipe all the data in your HDD.
Windows 11 Clean Installation-