We announced the upcoming end-of-support for the AWS CLI v1. For dates, additional details, and information on how to migrate, please refer to the linked announcement. For more information see the AWS CLI version 2 installation instructions and migration guide.
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The User Notifications API Reference provides descriptions, API request parameters, and the JSON response for each of the User Notifications API actions.
User Notification control plane APIs are currently available in US East (Virginia) - us-east-1 .
GetNotificationEvent and ListNotificationEvents APIs are currently available in commercial partition Regions and only return notifications stored in the same Region in which they’re called.
The User Notifications console can only be used in US East (Virginia). Your data however, is stored in each Region chosen as a notification hub in addition to US East (Virginia).