aws sso-admin create-instance (doc). Currentlhy there is not available terraform resource to create SSO instances.
aws sso-admin create-instance
aws sso-admin [ create-instance | describe-instance ]
aws_ssoadmin_permission_set, aws_ssoadmin_managed_policy_attachment
aws_ssoadmin_permission_set_inline_policy
aws_ssoadmin_account_assignment
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