How to have unique_name with Ansible and DO?

Trying to get my Ansible playbook to keep unique_names, but I can’t get this feature to work. Followed the tutorial on Ansible with DO 2.0 Api, but every time I run my playbook, totally new droplets are created with the SAME names!

Here’s my playbook, which otherwise works fine.

---
- hosts: digitalocean

  vars:
    do_token: xxxx
    droplets:
    - droplet-one
    - droplet-two

  tasks:
  - name: ensure key exists at DigitalOcean
    digital_ocean: >
      state=present
      command=ssh
      name=demo
      ssh_pub_key={{ lookup('file', '~/.ssh/id_rsa.pub') }}
      api_token={{ do_token }}
    register: demo


  - name: ensure droplets exist
    digital_ocean:
      state: present
      command: droplet
      name: "{{item}}"
      unique_name: yes
      size_id: 512mb
      region_id: sfo1
      image_id: 15764687
      private_networking: "yes"
      ssh_key_ids: "{{ demo.ssh_key.id }}"
      api_token: "{{ do_token }}"
    with_items: "{{droplets}}"
    register: droplet_details

  - debug: msg="IP is {{ item.droplet.ip_address }}"
    with_items: droplet_details.results