How can i gather ec2 elb facts using AWX/Ansible Tower?

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I have been following the ec2_elb_facts module and tried using the below example but in the debug logs i can see the aws values are completely getting ignored. How can i get this working?

- hosts: localhost
  vars:
    aws_access_key: accesskey
    aws_secret_key: secretkey
    ec2_region: us-east1
  gather_facts: true
  tasks:
    # Gather facts about all ELBs
    - action:
        module: ec2_elb_facts
      register: elb_facts

    - action:
        module: debug
        msg: "{{ item.dns_name }}"
      with_items: "{{ elb_facts.elbs }}"

Also, in tower how can i make sure these keys are used from encrypted file?