Magento 2.4 – Custom Observer for New Product Action

I have referenced a few different questions here and other articles online, but cannot for the life of me determine what is going wrong.

Referenced:

• Event not triggered when new product added in admin : Magento 2
• https://magecomp.com/blog/perform-operation-product-magento-2/
• Magento 2: how to insert data when submit product in backend?

Context:
Website is a multi-vendor marketplace. I’m looking to save a timestamp at the moment a new product is added to the catalog by a vendor.

Desired result:
Upon a new product being created, the Observer will insert the datetime to a custom database table. I understand this datetime is already stored in catalog_product_entity, but I need it saved in a separate table, as the datetime will be changed periodically for each product. The $vendorId portion can be ignored, which is why I’m simply using a static integer for that column until I’m able to get this working at all. Please also excuse the rudimentary method of saving said data to the table. Again, I know for a fact that method works elsewhere, which is why I’m using it here. To ensure that it’s not the issue, but something else wider in scope.

Actual Result: Nothing.

Files
NamespaceCustometcmodule.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
  <module name="Namespace_Custom" setup_version="0.0.1">
    <sequence>
         <module name="Magento_Catalog"/>
     </sequence>
  </module>
</config>

NamespaceCustomregistration.php

<?php MagentoFrameworkComponentComponentRegistrar::register(
MagentoFrameworkComponentComponentRegistrar::MODULE, 'Namespace_Custom',
__DIR__
);

NamespaceCustometcadminhtmlevents.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="catalog_product_new_action">
    <observer name="Namespace_Custom_Product_Save_After" instance="NamespaceCustomObserverAdminhtmlProductSaveAfter" />
</event>

NamespaceCustomObserverAdminhtmlProductSaveAfter.php

<?php

namespace NamespaceCustomObserverAdminhtml;

use MagentoFrameworkEventObserver;
use MagentoFrameworkEventObserverInterface;

class ProductSaveAfter implements ObserverInterface
{
  /**
   * @var ObjectManagerInterface
  */
   protected $_objectManager;

  /**
  * @param MagentoFrameworkObjectManagerInterface $objectManager
  */
public function __construct(
    MagentoFrameworkObjectManagerInterface $objectManager
) {
    $this->_objectManager = $objectManager;
}

public function execute(MagentoFrameworkEventObserver $observer)
{
 
    $product = $observer->getEvent()->getProduct();
//  $objectManager = MagentoFrameworkAppObjectManager::getInstance();

    if($product->isObjectNew()){
      $productId = $product->getId();        


      $resource = $objectManager->get('MagentoFrameworkAppResourceConnection');
      $connection = $resource->getConnection();
      $table = $resource->getTableName('catalog_product_custom');

      $query = "INSERT INTO " . $table . " (entity_id, vendor_id, date_time)
      VALUES ($productId, 99, UNIX_TIMESTAMP())";
      $connection->query($query);
    }

}

}

I have also tried using catalog_product_edit_action event.