Extension is not working

Hi all,
if somebody can review code,link bellow

this is idea:
Every customer after registration gets tag SignedNoOrder made by flow bulder.Now i want rule that if customer make order,tag is automaticly removed.Since entites could not be mixed,i made small app,added on link which removes tag if customer place order.Well,it is not working,i tryed milion times,adjusting and checking if something is missing.Since my programing skils are mid level,if somebody can review and help.
Shopware 6 is platform

Did you debug if there is a return value?

$criteria = new Criteria();
$criteria->addFilter(new EqualsFilter('name', 'SignedNoOrder'));

$tagResult = $this->tagRepository->search($criteria, $context);
if ($tagResult->count() === 0) {
    return;
}

$tagId = $tagResult->first()->getId();

Thank You for answer,i cannot catch logs.seems like plugin is not loading and i don’t know why