Unable to render Product fields in Twig Template

I cannot get any of the product fields to show in my theme such as {{ product.title }} and {{ product }} in my commerce--product.html.twig file.

Also commerce--product.html.twig was not seen but page--product-page.html.twig was the only twig file that triggered a response from Drupal.

I've followed the directions from this URL but still no product fields are rendering.

I've set the default and full content view modes as well.

What is required in my theme in order to render the fields and create a custom twig template?