Hello there,
Good Day!!!
We’re here to assist you with this one.
Automatic Email part is rely on WP CRON – so make sure cron is enabled in your side? For that we added Status Menu in v2.2 – Go to Admin Dashboard -> Instock Notifier -> Status
Also take the screenshot of that page and share with us.
We also keep record each activities of our plugin as log – Please check that as well whether automatic email part really triggered in your side as per the status change(out of stock to instock)
Log can be checked here Admin Dashboard -> WooCommerce -> Status -> Logs – In there top right dropdown find the prefix back-in-stock-notifier with latest date has all the information about the process(post that as well for further assist).
Thanks.