Installation of Ansible Automation Platform with private automation hub is failing at task: Place AAP CA certificate

Issue

• Installation of AAP 2.4 failed with below error for private automation hub:

  TASK [ansible.automation_platform_installer.certificate_authority : Place AAP CA certificate] ***
  fatal: [automationhub.example.com]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'aap_ca_cacert'. 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'aap_ca_cacert'\n\nThe error appears to be in '/home/ansible/ansible-automation-platform-setup-bundle-2.4-7-x86_64/collections/ansible_collections/ansible/automation_platform_installer/roles/certificate_authority/tasks/add_cacert.yml': line 17, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Place AAP CA certificate\n  ^ here\n"}