After restoring my xbox 1 my code for minecraft is not working.

You need your gamer id in order to download minecraft. If you cant remember it or your email used. You can contact xbox for help here. https://beta.support.xbox.com/contact-us

After the code has been used the game will be linked to your account.

if you log in to your account and look in "my games and apps" you should find it in your games in the section "ready to install" and you can install it from there.

I restored my Xbox as I was having start-up problems and when I restored the system I downloaded all my Minecraft save games. Now Minecraft says all the saved games are corrupted and are unplayable.

I’ve tried restarting the system, reinstalling Minecraft, downloading the saved games again - nothing has worked.

I started a new game and then I thought maybe I should do another restore, thinking maybe there was a problem with the restore. Well now it turns out that the new save game is also corrupted after the restore - this tells me the cloud save capability for
Minecraft is a pile of garbage.

Is there a way of fixing these games or downloading them from the cloud so they can be fixed elsewhere?

I did try, but I migrated my Minecraft account to this Microsoft account, and I don't need to recover it. I need to restore Minecraft itself on my account because it's not working on my account!

The only thing that worked for me was resetting my Xbox One X to factory defaults. It didn't restore the map that I worked on for six months, which was heartbreaking, but I could create new Minecraft maps.