Windows – Disable notifications for Outlook applications with GPO

I have been trying to create a GPO that would deactivate Outlook 365 notifications that appear on the desktop. I have tried the Office Administrative Templates 2016/365 but they do not stop the notifications coming from Windows 10 "Notification and actions"

I have been able to disable all notifications through GPO, but this is unacceptable since we use softphones and we need to see these notifications. I know it's possible manually, but I have not found a link to a GPO that works only for the Outlook application.

Any help would be great, thank you.