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It sounds like you're connecting to the MDS domain, rather than the specific CMA-1 Domain.

Your ansible host/target should be the primary MDS. Then in the playbook, make sure to add a variable with your target domain with the ansible_checkpoint_domain variable. In my example below, my domain name is Domain1.

---
- name: "Show Hosts in the Domain"
  gather_facts: no
  hosts: mds-primary
  vars:
     ansible_connection: httpapi
     ansible_httpapi_use_ssl: True
     ansible_httpapi_validate_certs: False
     ansible_network_os: check_point.mgmt.checkpoint
     ansible_checkpoint_domain: Domain1

  tasks:
    - name: show-checkpoint-hosts
      cp_mgmt_host_facts:
        limit: 100
      register: show_hosts

    - debug:
        msg: "{{ show_hosts }}"