I have this for the moment :

My controller:

#[Route('/statistic')]
class StatisticController extends AbstractController
{
    #[Route('/team-time/{teamId}/{startString}/{endString}', defaults: ['teamId' => null, 'startString' => null, 'endString' => null], name: 'statistic_team_time', methods: ['GET', 'POST'])]
    public function teamTime(
        Request $request,
        EntityManagerInterface $em,
        StatisticService $statisticService,
        TimeService $timeService,
        SessionInterface $session,
        StatisticXlsxGenerate $statisticXlsxGenerate,
        ?string $teamId = null,
        ?string $startString = null,
        ?string $endString = null
    ): Response {
        $teamId ??= $request->get("workforce");
        $startString ??= $request->get("start");
        $endString ??= $request->get("end");

        [$start, $end] = $this->getStartAndEndDates($startString, $endString);

        $team = $teamId ? $em->getRepository(Team::class)->find($teamId) : null;

        if (!$this->isTurboRequest($request)) {
            $form = $this->createForm(TeamTimeType::class, [
                'workforce' => $team,
                'start' => $start,
                'end' => $end,
            ]);

            $form->handleRequest($request);

            if ($form->get('export')->isSubmitted() && $form->isValid()) {
                $data = $form->getData();
                $teamId = $data['workforce'];
                $start = $data['start'];
                $end = $data['end'];

                
                return $this->downloadXlsx($teamId, $start, $end, $statisticService, $em, $statisticXlsxGenerate);
            }
            return $this->render('statistic/workforce_time.html.twig', [
                'form' => $form->createView(),
                'title' => 'team_time_statistic',
                'route' => 'statistic_team_time',
                'searchOnLoad' => (null !== $teamId),
            ]);
        }

        $stats = $statisticService->getTeamTime($team, $start, $end);
        $chart = $statisticService->getWorkforceTimeChart($stats);
        $session->set('team_stats', $stats);
        return $this->renderTurbo('statistic/_workforce_time.html.twig', [
            'stats' => $stats,
            'workedDays' => $timeService->getWorkDayDurationBetweenDates($start, $end),
            'chart' => $chart,
            'teamSize' => count($team->getWorkers()),
        ]);
    }
    private function downloadXlsx(
        $teamId,
        $start,
        $end,
        StatisticService $statisticService,
        EntityManagerInterface $em,
        $statisticXlsxGenerate
    ): StreamedResponse {
        if (!$teamId || !$start || !$end) {
            throw new InvalidArgumentException("Missing parameters.");
        }

        $team = $em->getRepository(Team::class)->find($teamId);
        if (!$team) {
            throw $this->createNotFoundException("Team not found.");
        }

        $stats = $statisticService->getTeamTime($team, $start, $end);
        $response = $statisticXlsxGenerate->generateXlsx($stats);

        $response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        $response->headers->set('Content-Disposition', 'attachment; filename="team_time_stats.xlsx"');
        $response->headers->set('Cache-Control', 'max-age=0');
        $response->headers->set('Expires', '0');
        $response->headers->set('Pragma', 'public');
        $response->headers->set('X-Accel-Buffering', 'no');
        return $response;
    }

And this is the function generating the XLSX File in StatisticXlsxGenerate Service :

public function generateXlsx(array $stats): StreamedResponse
    {
        $response = new StreamedResponse(function () use ($stats) {
            $spreadsheet = new Spreadsheet();
            $sheet = $spreadsheet->getActiveSheet();

            $this->setHeader($sheet);
            $this->populateData($sheet, $stats);
            $this->finalizeSheet($sheet);

            $writer = IOFactory::createWriter($spreadsheet, 'Xlsx');
            $writer->save('php://output');
        });

        $response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        $response->headers->set('Content-Disposition', 'attachment; filename="team_time_stats.xlsx"');
        $response->headers->set('Cache-Control', 'max-age=0');
        $response->headers->set('Expires', '0');
        $response->headers->set('Pragma', 'public');
        $response->headers->set('X-Accel-Buffering', 'no');

        return $response;
    }

I tried almost every header possible, Tried changing them on both the Controller and the XlsxGenerator Service but I always have the preview of the file but no file downloaded.

Anyone has this issue before or knows how to solve this kind of issues ?

Thank you in advance.