https://stackoverflow.com/questions/76429136/absible-add-host-could-not-match-supplied-host-pattern

Session.txt

$ ansible --version
ansible [core 2.14.2]
  config file = None
  configured module search path = ['/home/user/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/user/.local/lib/python3.9/site-packages/ansible
  ansible collection location = /home/user/.ansible/collections:/usr/share/ansible/collections
  executable location = /home/user/.local/bin/ansible
  python version = 3.9.5 (default, Nov 23 2021, 15:27:38) [GCC 9.3.0] (/usr/bin/python3.9)
  jinja version = 3.1.2
  libyaml = True

$ tree
.
├── inventories
│   └── default
│       └── hosts.yaml
└── playbook.yml

2 directories, 2 files

$ cat inventories/default/hosts.yaml 
---
my_original_servers:
  hosts:
    dev01:
    dev02:

$ cat playbook.yml 
---
- name: Choose start hosts
  hosts: my_original_servers
  gather_facts: false

  tasks:
    - name: Add hosts
      ansible.builtin.add_host:
        name: "{{ groups.my_original_servers.0 }}"
        groups: mock_host

- name: Do something with my app
  hosts: mock_host
  gather_facts: false

  tasks:
    - name: Dummy task
      ansible.builtin.debug:
        msg: Do something

$ ansible-playbook -i inventories/default/ playbook.yml 

PLAY [Choose start hosts] *****************************************************************************************************************************************************************************************

TASK [Add hosts] **************************************************************************************************************************************************************************************************
changed: [dev01]

PLAY [Do something with my app] ***********************************************************************************************************************************************************************************

TASK [Dummy task] *************************************************************************************************************************************************************************************************
ok: [dev01] => {
    "msg": "Do something"
}

PLAY RECAP ********************************************************************************************************************************************************************************************************
dev01                      : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0