failed to get ECR credentials: credentials not found in native keychain

[warezWally]

I'm recieving this error, with the "put" task in our pipe staing that basic auth credentials not found.

    type: docker-image
    icon: docker
    source:
      repository: ((ACCOUNT)).dkr.ecr.((REGION)).amazonaws.com:443/((ENV))-((WORKFLOW))-ecr
      aws_access_key_id: ((KEY))
      aws_secret_access_key: ((SECRET))

The access_key and secret are pulled from a Concourse secrets manager and work in other areas of the pipe. I also have ecr:* in the IAM policy of the User in question. Yet still getting the error in the title. I even tried avoiding the variable and going verbatim. What am I missing?