If your Outlook notifications not working on the Outlook app for Windows then you have to go to its own notification setting. You have to check and make active new message alerts in the Outlook app.
Follow the given steps to enable the notification:
Step 1: Open Outlook on your system.
Step 2: Click on File > Options.
If you are unable to do it on your own then you can connect with us, we have a specialized team who helps you get it done in just simple steps.