I've configured my **Magento ver. 2.2.4** to send email to customers that have registered themselves for an stock alert when the product which is "out of stock" goes to be back 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, orders ... but not for a restock of an item. I've added the cron to "*****" in the database and the default cron is running on my server.

I've seen a lot of plugins with insane prices, but it's a Magento core feature so I don't want to pay a huge amount for this.

If anyone has a solution it would be nice if you share :D

Thank you in advance for your help.