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perhaps `Dockerrun.aws.json` is missing something like this:
```  "Authentication": {
    "Bucket": "mybucket",
    "Key": "docker_hub_auth.json"
  },```


does anyone have an example of how to achieve the above?

Have you tried the ECR credential helper? <https://github.com/awslabs/amazon-ecr-credential-helper>

I can get the image into ECR, but the issue is Elastic Beanstalk pulling it. Will ECR Credential Helper help with that? I.e. will it be able to render something I can put in the relevant "Authentication" section in Dockerrun.aws.json ?

hmm, the EB log is not auth-related, but has "invalid reference format". I'll look into that (seems as though the image is in an array, not a string).
&gt;  2022/03/15 14:59:36.478717 [ERROR] An error occurred during execution of command [app-deploy] - [Docker Specific Build Application]. Stop running the command. Error: failed to pull docker image: Command /bin/sh -c docker pull ['<http://992954656374.dkr.ecr.eu-west-2.amazonaws.com/cpr-container-registry-043f64e:xxxxxxx|992954656374.dkr.ecr.eu-west-2.amazonaws.com/cpr-container-registry-043f64e:xxxxxxx>'] failed with error exit status 1. Stderr:invalid reference format