---
- name: Demonstration of failed when
  hosts: nodes
  tasks:
        - name: Print the message
          debug:
            msg: "Incompatiable host not allowed in the list"
          when: ansible_default_ipv4.address == "192.168.0.2"

        - name: installing the zsh package
          dnf:
            name: zsh
            state: latest
          failed_when: ansible_default_ipv4.address == "192.168.0.2"
...
# failed_when is used to mark the task a failed in the ansible even if the task executed itsel correctly
# the 2nd task above is marked as failed in the ansible during  playbook execution even though it is executed successfully with rc 0