custom Gutenberg block will not load

I’m using this tutorial to create a custom block.

This is my index.js:

import './blocks/mandoe-logo-gallery/index.js';

This is my ./blocks/mandoe-logo-gallery/index.js:

/**
 * Registers a new block provided a unique name and an object defining its behavior.
 *
 * @see https://developer.wordpress.org/block-editor/developers/block-api/#registering-a-block
 */
 import { registerBlockType } from '@wordpress/blocks';

 /**
  * Lets webpack process CSS, SASS or SCSS files referenced in JavaScript files.
  * All files containing <code>style</code> keyword are bundled together. The code used
  * gets applied both to the front of your site and to the editor. All other files
  * get applied to the editor only.
  *
  * @see https://www.npmjs.com/package/@wordpress/scripts#using-css
  */
 import './style.scss';
 import './editor.scss';
 
 /**
  * Internal dependencies
  */
 import Edit from './edit';
 import save from './save';
 
 /**
  * Every block starts by registering a new block type definition.
  *
  * @see https://developer.wordpress.org/block-editor/developers/block-api/#registering-a-block
  */
 registerBlockType( mandoe/hero-daily-sales, {
     /**
      * Used to construct a preview for the block to be shown in the block inserter.
      */
      title: __('Mandoe Daily Sales'), // Block title.
      icon: 'shield', // Block icon from Dashicons → https://developer.wordpress.org/resource/dashicons/.
      category: 'common',
      keywords: [
          __('mandoe'),
          __('hero')
      ],
      attributes: {
		left_text: {
			type: 'string',
            source: 'html',
            selector: 'div.left_text'
		},
		right_text: {
			type: 'string',
            source: 'html',
            selector: 'div.right_text'
		},
		background_image: {
			type: 'string',
			source: 'attribute',
			selector: 'img.hero-image',
			attribute: 'src',
		},
		mobile_image: {
			type: 'string',
			source: 'attribute',
			selector: 'img.daily-sales-mobile-img',
			attribute: 'src',
		}
	},      
     /**
      * @see ./edit.js
      */
     edit: Edit,
 
     /**
      * @see ./save.js
      */
     save,
 } );

I have run npm build with no errors.

Why would my custom block not appear in the Gutenberg editor?

Help appreciated.