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It seems like the issue you are facing with the `ecs:push` work pool in Prefect 2.14.20 might be due to a mismatch in the platform or architecture of the Docker image or the task definition used by ECS.

From the documentation and issues I found, here are a few things to check and consider:

1. *Ensure Correct Image Architecture*: Confirm that the Docker image you are using is indeed built for the `amd64` architecture. You can verify this by running the following command:
    ```bash
    docker inspect --format='{{.Os}}/{{.Architecture}}' &lt;your_image&gt;
    ```
    Make sure the output matches `linux/amd64`.

2. *Verify ECS Task Definition*: Ensure that the task definition used by your ECS cluster is correctly specified to use the `amd64` architecture. AWS ECS supports different compute platforms, and there could be a mismatch if the task definition isn't aligned with the image architecture.

3. *ECS Cluster and VPC Setup*: When creating an ECS cluster for running Prefect flows, ensure that resources such as the VPC, IAM roles, and ECS cluster configurations are set up correctly. Refer to the <https://docs-2.prefect.io/latest/guides/deployment/push-work-pools/|Prefect ECS guide> for detailed steps on provisioning these resources.

4. *Error Tracking*: Check the detailed logs of the ECS task and the Docker container to gather more information regarding the exit code 1. This could give more insight into where the failure is happening.

From the GitHub issues, there are a few similar concerns regarding ECS and infrastructure setups. One notable issue highlighted the challenges with GPU-based AWS jobs, but it also has relevant points for general ECS setups. Specifically, using a hybrid AWS ECS pool and setting up appropriate ECS clusters and task definitions (<https://github.com/PrefectHQ/prefect/issues/13969|GitHub Issue>).

If you continue to face issues, consider opening a bug report or seeking help from the Prefect community, as there might be configuration nuances specific to your environment.

For further reference, you can check the detailed guide on <https://docs-2.prefect.io/latest/guides/deployment/push-work-pools/|push work pools with ECS in Prefect 2.x>.

Feel free to reach out if you have more questions!