Help with connector configuration option "AWSSecretsArnList"

I am currently trying to set up a Docker Application Deployment connector in AWS IoT GreenGrass and since I need to authenticate the private repository that I will be pulling the docker images from, I also need to add the secret that I've created with the auth values to the configuration. The problem is that when I try to add the arn of the secret to the "AWSSecretsArnList" option, it gives me this warning: "AWSSecretsArnList: List of ARNs" I've tried following the example and pattern that are given inside the documentation about the Docker Application Deployment at https://docs.aws.amazon.com/greengrass/v1/developerguide/docker-app-connector.html#docker-app-connector-param , but it seems to be fruitless. Has anyone had similar experience and how did you find a way to resolve it. Am I overlooking something inside the documentation, or do I need to take a look somewhere else? Thanks!