We have created a new Elastic Beanstalk application, however the current health of the application is logged as Severe due to several errors.
If you select the Logs option on the left hand menu and then select Request Logs | Last 100 Lines, you should be presented with a Download link that allows you to review the most recent log activity:
A separate tab should open in your browser, displaying various Elastic Beanstalk logs. At the top, you should see the ECS agent logs, and the most recent error should indicate that the ECS agent cannot pull the image into your Dockerrun.aws.json ...