The WP8.1 application background task does not have the push notification capability.

For Push Notifications on WP8.1, with using WNS I get the following exception : The application background task does not have the push notification capability. (Exception from HRESULT: 0x803E0119)

In my Package.appxmanifest file I have checked in the Internet capabilities, set WNS in WMAppManifest.xaml.

What other configuration is required for WNS.

It's happen if you have already installed the application and then you add the notification capability. Uninstall your app, install it and it should work fine.