Php – ServiceNotFoundException when trying to use TYPO3 12 ActionController

When Trying to register my DummyController to use it as a Typo3 Plugin, I get the following error:
ServiceNotFoundException: You have requested a non-existent service "MyVendorNameTypo3StarterSitepackageControllerDummyController"

I tried to do everything like the documentation states, and also did some research, bud was unable to resolve the issue. Here is my code:

My controller:

<?php

namespace MyVendorNameTypo3StarterSitepackageController;

use PsrHttpMessageResponseInterface;

class DummyController extends ActionController
{
    public function dummyListAction(): ResponseInterface
    {
        return $this->htmlResponse();
    }
}

My DummyRepository.php:

<?php

namespace MyVendorNameTypo3StarterSitepackageDomainRepository;

use TYPO3CMSExtbasePersistenceQueryInterface;

class DummyRepository extends Repository
{
    // this already has some default functions, like findAll(), inherited from the Repository class.
}

My Services.yaml file:

services:
  # general settings
  _defaults:
    autowire: true
    autoconfigure: true
    public: false

  MyVendorNameTypo3StarterSitepackage:
    resource: '../Classes/*'

My ext_localconf.php:

<?php

use MyVendorNameTypo3StarterSitepackageControllerDummyController;
use TYPO3CMSExtbaseUtilityExtensionUtility;

defined('TYPO3') or die('Access denied.');
/***************
 * Add default RTE configuration
 */
// $GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['typo3_starter_sitepackage'] = 'EXT:typo3_starter_sitepackage/Configuration/RTE/Default.yaml';

/***************
 * PageTS
 */
TYPO3CMSCoreUtilityExtensionManagementUtility::addPageTSConfig('<INCLUDE_TYPOSCRIPT: source="FILE:EXT:typo3_starter_sitepackage/Configuration/TsConfig/Page/All.tsconfig">');

ExtensionUtility::configurePlugin(
    'typo3_starter_sitepackage',
    'DummyList',
    [DummyController::class => 'dummyList'],
);

With this code I am able to select the Plugin through the Typo3 Backend, but then the ServiceNotFoundException is thrown. I am aware that the Controller doesn’t return anything right now, but I think that’s not the cause of this issue.

I am working on Windows using XAMPP with PHP 8.2, Typo3 12.4.10.