Outlook 2016 Mail app didn't even exist in the list of apps in Settings – System – Notifications & Actions. So, even though Outlook 2016 had configured correctly, the Windows 10 notification system still had no idea that a Mail app existed. Because of this reason, i am not getting any email notifications (desktop Alerts).
In one of the forum i found out that 'The Mail app hadn't registered correctly with Windows 10 when it installed, or the registry key had become corrupted.'
Please help me fixing this issue.