Notification of the receipt of Bitrix goods does not come?

Question

1C-Bitrix

Good time of the day. Goods Notification not working. There are subscriptions for products.
In the settings of the online store, the checkbox Notify me when goods arrive is enabled. Quantitative accounting is also included. The SALE_SUBSCRIBE_PRODUCT mail template is also active. Where to dig?
Bind sending a mail event to
AddEventHandler("catalog", "OnBeforeProductUpdate", "OnBeforeProductUpdateHandler");
AddEventHandler("catalog", "OnBeforeProductAdd", "OnBeforeProductAddHandler");
But it works only when changing handles. When unloading from 1C, there is no such miracle