I've configurated my magento 2.2.4 to send email to customers that have registred themself for an alert stock when the product out of stock is going to be in stock, but when i try to do this i don't receive any message for this, it's strange because i receive message for new users, newsletter, order ... but noot for a restock of an item. I've putted the cron to "*****" in the database and the default cron is running on my server.

I've seen a lot a plugin with a lot of insane price for this, but it's a magento feature so i don't want to pay a huge amount for this.

If anone has a solution it would be nice to share :D

Thank you in advance for your help