Why is my XCLASSes action for the EXT:sf_event_mgt EventController ignored?

I’m trying to add a button that allows users to subscribe to my event calender via a webcall:// link. I use type=9819 to trigger the function.

I can‘t get my icalAction to work, it just gets ignored and typo3 uses the listAction from the extension instead.

Im using typo3 13.4 and sitepackage. I would like to manage the output in a fluid template

My folder structure is:

/packages
└── studilife
    ├── Classes
    │    └── Controller
    │        └── EventController.php
    ├── Configuration
    │   └── Sets
    │       └── Studilife
    │           └── TyposScript
    │               └── setup.typoscript
    ├── Resources
    │   └── Private
    │       └── Extensions
    │           └── SfEventMgt
    │               └── Templates
    │                   └── Event
    │                       └── Ical.html
    └── ext_localconf.php

This is my code so far:

ext_localconf.php:

$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects'][DERHANSENSfEventMgtControllerEventController::class] = [
    'className' => StudentStudilifeControllerEventController::class,
];

TYPO3CMSExtbaseUtilityExtensionUtility::configurePlugin(
    'SfEventMgt',
    'Event',
    [
        DERHANSENSfEventMgtControllerEventController::class => 'list,detail,register,ical'
    ],
    []
);

setup.typoscript:

plugin.tx_sfeventmgt {
    view {
        templateRootPaths {
            100 = EXT:studilife/Resources/Private/Extensions/SfEventMgt/Templates/
        }
        partialRootPaths {
            100 = EXT:studilife/Resources/Private/Extensions/SfEventMgt/Partials/
        }
        layoutRootPaths {
            100 = EXT:studilife/Resources/Private/Extensions/SfEventMgt/Layouts/
        }
    }
    settings {
        calendar{
            showWeekNumber = 0
        }
    }
}

pageEventICalendar = PAGE
pageEventICalendar {
    typeNum = 9819
    settings.format = txt
    config {
        disableAllHeaderCode = 1
        xhtml_cleaning = none
        admPanel = 0
        metaCharset = utf-8
        locale_all = en_EN
        additionalHeaders.10.header = Content-Type:text/calendar;charset=utf-8
        disablePrefixComment = 1
        linkVars >

    }

    10 = USER
    10 {
        userFunc = TYPO3CMSExtbaseCoreBootstrap->run
        extensionName = SfEventMgt
        pluginName = Event
        vendorName = DERHANSEN
        controller = Event
        action = ical
    }
}

eventController.php:

<?php
namespace StudentStudilifeController;

class EventController extends DERHANSENSfEventMgtControllerEventController
{
    public function icalAction()
    {
        $events = $this->eventRepository->findAll();
        $this->view->assign('events', $events);

        $this->view->setFormat('txt');
        header('Content-Type: text/calendar; charset=utf-8');
        header('Content-Disposition: attachment; filename="events.ics"');
    }
}

Im trying to get my Action to be recognized by typo3. The typoscript works fine so far, but the eventController.php is just ignored. Its my first time trying to change the behaviour of an extension, so i probably miss something very basic. I tryed to use this official typo3 documentation: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Xclasses/Index.html.

Thanks for your help