Between 2:48 PM and 5:28 PM PDT we experienced periods of increased error rates and latencies for IAM operations impacting all AWS Regions. This issue affected mutating operations of IAM Users and Roles as well as Assume Role. Other AWS Services that performed these IAM operations were also impacted. Authentication using existing IAM users and roles was not affected. The majority of the impact was mitigated at 4:12 PM, and the issue was fully resolved at 5:28 PM. The issue has been resolved and the service is operating normally.