We use ecs local container endpoints when developing locally which works nicely when developing new to use AWS SSO to get tokens. Unfortunately the last release of this project is using an older version of the aws sdk and doesn't support the shared SSO session
https://github.com/awslabs/amazon-ecs-local-container-endpoints/issues/278
Is it possible to get a new version built/published. Happy to help in someway if that helps.