Handle 'state' (present,attached,absent,detached)

tasks/register.yml

@@ -3,8 +3,10 @@
   ansible.builtin.command: "pro attach {{ ubuntu_pro_token }}"
   become: yes
   register: reg_pro_attach
+  changed_when: reg_pro_attach.rc == 0
   failed_when: (reg_pro_attach.rc != 0) and ('This machine is already attached to' not in reg_pro_attach.stderr_lines[0])
 
 - name: Print 'pro attach' command output
   ansible.builtin.debug:
     var: reg_pro_attach
+  when: debug