Disable buttons in Javascript

Question

I have a small program, which I made for my grandson, which shows an image of an animal, and the person has to guess the animal's name by clicking on the letters that make up the animal's name. These letters are buttons. What is happening? When the person gets the letter right, I deactivate that letter so it doesn't click again. The first time it works perfectly. When the person gets the name right, I change the image and call a routine that enables all the buttons. But this routine isn't working. The letters used in the previous image remain disabled.

The routine that disables the buttons is as follows:

function activateButtons()

{

 const todosButtons = document.querySelectorAll('.teclas button');

 todosButtons.forEach(button => {

 botao.disabled = false;

 });
```}

Because it does not work?