{"id":"iam-service-principal-format","text":"AWS service principals follow the format `service-name.amazonaws.com`; opt-in region cross-region requests use regionalized format `service-name.{region}.amazonaws.com`, but role trust policies should use the non-regionalized form since IAM resources are global.","truth_value":"IN","source":"entries/2026/03/11/IAM-latest-UserGuide-reference_policies_elements_principalhtml.md","source_url":"","source_hash":"6b474327217a2bc0","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"iam-service-principal-format","truth_value":"IN","reason":"premise"}]}}