Typos.

tasks/users.yml

@@ -34,7 +34,7 @@
   register: new_user_setup
 
 - name: Setup User ssh_key
-  authorized_key: 
+  authorized_key:
     user: "{{ user.name }}"
     state: "{{ user.state | default('present') }}"
     key: "{{ user.ssh_key }}"