- AWS STS now supports cross‑partition federation, letting an IAM identity in one partition obtain temporary credentials for a role in another partition via GetWebIdentityToken and AssumeRoleWithWebIdentity.
- Removes the need for long‑term credentials across partitions, enhancing security and enabling governance and CloudTrail auditing.
- Feature is available at no additional charge across commercial, GovCloud, China, and European Sovereign Cloud regions.