Problems with recovering Macbook password

That code is a FileVault Recovery key: FileVault recovery options - Apple Support. If you no longer have that code and you eventually exhaust all attempts to retrieve it (from iCloud, for example) then the only recourse is to erase the startup disk:

Erase and reinstall macOS

How to start up from macOS Recovery - Apple Support

Use macOS Recovery on a Mac with Apple silicon - Apple Support

If you still don't get anywhere please write back and I'll attempt to duplicate the concern. Let us know how far you get.

Then it's simple, because you did not bother to safely store the password you need to take the computer to your local Apple Authorized Service Provider along with proof of ownership and they can unlock it for you.

Not to lecture you, but you should be using either a third party password manager such as 1Password or start using the Password app on your computer and sync with your other devices using iCloud so you can safely manage passwords and other information you need to have. Operating any device and solely using your memory to remember is a poor idea.

John Galt wrote:

...

If you still don't get anywhere please write back and I'll attempt to duplicate the concern.

I did. To follow up, what you need to do after booting Recovery is to ignore requests for a password or a FV Recovery Key or anything else you don't know. Instead, select the Recovery Assistant menu at the upper left, adjacent to the  (Apple) menu, and select Erase Mac...

Not one but two confirmation dialogs will appear asking if that's what you really want to do. When it finishes you will need to reinstall macOS, followed by restoring its content from a Time Machine backup. Otherwise, set it up as a new Mac the same way you did when you bought it.

That's all you can do and there is no more. If you still encounter problems by all means write back — perhaps I missed a step or two — but at that point your only recourse may be to schedule a Genius Bar reservation. Should things reach that point you will absolutely, positively require that Mac's original dated sales receipt or invoice unequivocally demonstrating to their satisfaction that you are that Mac's rightful owner. Apple is deadly serious about your data security, so expect rigid adherence to that requirement.

I'll await your report of success.

If you forgot your Mac login password - Apple Support eventually leads to the solution.