This article explains how to set up Outlook email notifications in Windows 10 so that you'll be alerted when a new email arrives in your Outlook inbox. Instructions apply to Outlook 2019, 2016, 2013; and Outlook for Microsoft 365.
How to Fix the Issue of Not Getting Alert for New Email Notification in Outlook in Windows 10
Here's how to enable new message notification banners in Outlook with Windows 10:
In Windows 10, select the Start icon.
Select Settings (gear icon).