Change IAM registration region

Hello.

If you want to change the region of IAM Identity Center, you need to delete all settings once as described in the document below.
https://docs.aws.amazon.com/singlesignon/latest/userguide/regions.html

AWS Organizations supports only one AWS Region at a time. To enable IAM Identity Center in a different Region, you must first delete your current IAM Identity Center configuration. Switching to a different Region also changes the URL for the AWS access portal, and you must reconfigure all permission sets and assignments.