Actions added through RE NXT webview will sync to the Constituent record in the database view.

If viewing from an Action Reminder Dashboard panel within The Raiser's Edge database view, the actions will not appear because there is no option to set a Reminder when adding an Action through NXT.

Actions added in NXT Webview can be added to the calendar once the calendar preferences have been set up.
Otherwise, if needed on the Action Reminder panel, the Action record will need to be edited within database view so that Action Reminders will populate based on the Notify field.

This article will assist in troubleshooting Actions not appearing in the Action Reminders