Enabling or disabling opt-in Regions in AWS User Notifications
Although most AWS Regions are active by default for your AWS account, certain Regions are activated only when you manually select them. This document refers to those Regions as opt-in Regions. In contrast, Regions that are active by default, as soon as your AWS account is created, are referred to as commercial Regions, or simply, Regions.
If you choose to select an opt-in Region as your notification hub, enable it first by following the steps in Enabling a Region. Enabling or disabling an opt-in Region may impact your notifications experience. For a list of supported opt-in Regions, see Opt-in Regions.
Disabling a notification hub Region
You must have a notification hub configured to create notification configurations. If you disable an opt-in Region that contains your only notification hub, you can't create new notification configurations. You also can't access previous notifications until you enable the opt-in Region or create a new notification hub.
Choosing a notification hub Region that isn't enabled
You must enable an opt-in Region to use a notification hub you create in that opt-in Region. If you don't enable the opt-in Region, your notification hub remains inactive. You can't create notification configurations or view notifications until you enable that opt-in Region on your account or select a new notification hub.