Deploy AWS applications and access AWS accounts across multiple Regions with IAM Identity Center

This AWS blog post describes how to extend IAM Identity Center (AWS Single Sign-On) across multiple AWS Regions using multi-Region replication: create and replicate multi-Region customer-managed KMS keys, add additional Regions to the Identity Center instance, update external IdP configurations (ACS URLs and bookmark apps), test regional access via the AWS access portal and CLI, and deploy/test AWS managed applications in the new Region; it also outlines optional DNS/failover patterns and administrative differences between primary and additional Regions.