WebCatalog supports notifications out of the box. But for some web apps, to receive notifications, you will need to manually configure additional web app settings.
Here is a list of how you can fully enable notifications in some popular web apps.
Gmail
Google Drive
Outlook
Outlook uses an in-house solution to display notifications, instead of standard HTML5 Notification API. Thus, WebCatalog/Singlebox won’t be able to integrate Outlook’s notifications with your system. Instead, notifications will still show up in the right corner of Outlook’s window. For details, see https://github.com/webcatalog/webcatalog-app/issues/874.
Learn more at https://help.twitter.com/en/managing-your-account/enabling-web-and-browser-notifications