404 on large file upload for todo task attachment

[ThomasWiestBF]

Hello,
I am using the SDK version 2.4.0 and have encountered a strange behaviour/error. I am trying to upload a large file (~5MB) to a ToDo task. The initial POST request to create an upload session is successful, but the API gives me a 404 error with "Unknown Error" on the PUT request for the first file chunk.
Is there a bug or am i missing anything?
Thank you very much!

Code:

$attachmentInfo = new AttachmentInfo();
$attachmentInfo->setAttachmentType(new AttachmentType('file'));
$attachmentInfo->setName($attachmentName);
$attachmentInfo->setSize($fileSize);

$uploadSessionRequestBody = new CreateUploadSessionPostRequestBody();
$uploadSessionRequestBody->setAttachmentInfo($attachmentInfo);

$uploadSession = $this->client->me()
    ->todo()->lists()->byTodoTaskListId($taskListId)
    ->tasks()->byTodoTaskId($graphItemId)->attachments()
    ->createUploadSession()->post($uploadSessionRequestBody)->wait();

$largeFileUpload = new LargeFileUploadTask($uploadSession, $this->client->getRequestAdapter(), $fileStream);

try {
    $uploadSessionResult = $largeFileUpload->upload()->wait();
} catch (NetworkExceptionInterface $ex) {
    // resume upload in case of network errors
    $retries = 0;
    $maxRetries = 3;
    while ($retries < $maxRetries) {
        try {
            $uploadSession = $largeFileUpload->resume()->wait();
            if ($uploadSession) {
                break;
            }
        } catch (NetworkExceptionInterface $ex) {
            $retries++;
        }
    }
    throw $ex;
}

Initial POST:

Failing PUT