**To modify the account setting for your IAM user account** The following ``put-account-setting`` example enables the ``serviceLongArnFormat`` account setting for your IAM user account. :: aws ecs put-account-setting --name serviceLongArnFormat --value enabled Output:: { "setting": { "name": "serviceLongArnFormat", "value": "enabled", "principalArn": "arn:aws:iam::130757420319:user/your_username" } } For more information, see `Modifying Account Settings <https://docs.aws.amazon.com/AmazonECS/latest/developerguide/ecs-modifying-longer-id-settings.html>`__ in the *Amazon ECS Developer Guide*.