---
- name: create esxi host group
  hosts: all
  connection: local

  tasks:
  - name: create temporary esxi host group
    add_host:
      name: "{{ esxi_host }}"
      groups: esxi
      ansible_user: "{{ esxi_user }}"
      ansible_ssh_pass: "{{ esxi_pass }}"
    run_once: true

PLAY [create esxi host group] *************************************************************************************************

TASK [create temporary esxi host group] ***************************************************************************************
fatal: [dps1]: FAILED! => {"msg": "The field 'ssh_common_args' has an invalid value, which includes an undefined variable. The error was: 'ansible.vars.hostvars.HostVarsVars object' has no attribute 'ansible_host'"}