architecture In the same region, you can specify security groups as the source or the destination. Multi-region security groups If using different regions, this needs to be specified using an CIDR block. AWS IAM Identity Center (AWS SSO) For services released only in the Tokyo region - Only available to use in one region, such as the Tokyo region, and has no replication functionalities etc. - An independent IAM User management platform has been built separately to prepare for unavailability of AWS IAM Identity Center AWS Transfer Family - While this can be used in the Osaka region, as users are independent for each region, this needs to be created for each User.