Issue while deploying ECS application via codedeploy

The error you're encountering suggests there's a mismatch in the AWS account IDs associated with your ECS deployment. This type of error typically occurs when there's an inconsistency between the resources being used in the deployment. Here are some steps you can take to troubleshoot and resolve this issue:

1. Verify that all resources (ECS cluster, service, task definition, Application Load Balancer, and CodeDeploy application) are in the same AWS account. Double-check that you're not accidentally referencing resources from a different account.

2. Ensure that the IAM role associated with your CodeDeploy deployment group has the necessary permissions to interact with the ECS service and other related resources. The role might be missing some required permissions.

3. Check the task definition you're trying to deploy. Make sure it's created in the same account as your ECS cluster and service.

4. Review your CodeDeploy application and deployment group configurations. Verify that all the references to ECS resources (cluster, service, load balancer) are correct and belong to the same AWS account.

5. If you're using any cross-account roles or resources, ensure they are properly configured and have the necessary permissions.

6. Try updating your ECS service manually using the AWS CLI or console to see if you encounter the same error. This can help isolate whether the issue is specific to CodeDeploy or if it's a general ECS service update problem.

7. Check the AWS CloudTrail logs for any additional details about the failed API calls, which might provide more insight into the exact cause of the account ID mismatch.

If you've verified all these points and are still encountering the error, you may need to contact AWS Support for further assistance, as there might be an underlying issue with your account or service configuration that requires their intervention.
Sources
Troubleshoot Amazon ECS deployment issues - AWS CodeDeploy
General troubleshooting issues - AWS CodeDeploy