Go to the "Notifications" tab on the plugin settings page and make sure you have marked the checkbox of the "Email Notifications" option. This option enables sending messages to the administrator concerning users recently blocked or added to the Denylist. Also, make sure your email is entered correctly.
If you have checked all of the above-mentioned and everything seems to be correct, it is possible that the mailout was blocked or delayed significantly by your hosting. Also, it is likely that your emails are automatically moved to the spam box, so you should check it.
This article related to Limit Attempts by BestWebSoft plugin
Additional resources: Limit Attempts - User Guide
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