passing items to lookup

users.yml

---
- hosts: all
  vars:
   users:
   - user1
   - user2
  tasks:
  - name: create users
    user: name={{item}} state=present
    with_items: users

  - name: copy key
    authorized_key: user={{item}}
                    key="{{ lookup('file', '/etc/ansible/files/keys/' + item + '.pub') }}" manage_dir=yes
    with_items: users
~