Retreiving locked notebooks

Unfortunately, OneNote encrypts password-protected sections, and Microsoft does not provide a way to reset or recover a forgotten section password, even through Microsoft Support. To determine whether there are any other recovery possibilities, could you please confirm whether you originally created these notebooks using OneNote for Microsoft 365, OneNote 2016, or OneNote for Windows 10? Also, do you still have access to the computer where the notebooks were originally created, and do you remember approximately when you applied the passwords? Finally, have you checked whether the protected sections are still accessible on another device where you previously opened them?