- name: Suppression du disque réseau Z (Si il est présent)
    win_mapped_drive:
      letter: Z
      state: absent

  - name: Montage de partage
    win_mapped_drive:
      letter: Z
      path: \\samba\maintenance
      username: samba\Administrateur
      password: password
      state: present

  - name: Z Dir
    win_command: dir
    args:
      chdir: "Z:"
      register: dir_out
  - debug:
      var: dir_out

Result
TASK [Suppression du disque réseau Z (Si il est présent)] ************************************************************************************************************************************************************************************
changed: [192.168.151.169]

TASK [Montage de partage] ********************************************************************************************************************************************************************************************************************
changed: [192.168.151.169]

TASK [Z Dir] *********************************************************************************************************************************************************************************************************************************
fatal: [192.168.151.169]: FAILED! => {"changed": false, "cmd": "dir", "failed": true, "msg": "invalid working directory path 'Z:'", "rc": 2}
	to retry, use: --limit @/etc/ansible/playbooks/windows.retry

PLAY RECAP ***********************************************************************************************************************************************************************************************************************************
192.168.151.169            : ok=3    changed=2    unreachable=0    failed=1