Magento2: How to debug out of stock notification not working?

Question

I'm using the Luma theme in Magento 2.3.3, my other transactional emails are working properly. I've no idea how to start debugging it.

How could I start debugging this issue and what to consider?

Answer 1

I solved it checking following these steps:

• Check the DB table called product_alert_stock where you have all the alerts.
• Try to run the specific cron job called catalog_product_alert which sends the emails via Magerun2, you can run it via magerun sys:cron:run.
• Check if you have some SMTP or email module installed (e.g. Mailchimp), you can disable it to check, and check its logs.
• Change the theme to Luma via admin.
• You can try to disable all the third-party modules to finish your tests.
• Run the composer update to check if it's some issue already fixed.

If you didn't find the issue after all these steps, probably the issue is on your server.