Foreman Callback plugin report_type=proxy - how does it work?

Problem:
I installed ansible smart proxy foreman plugin:

I would like to use it along with ansible foreman callback plugin in order to report facts from the hosts to Foreman. I am not sure how this plugin is supposed to work. Was trying to figure it out, but unfortunately, documentation to say the least is not very extensive and informative:
https://docs.ansible.com/ansible/latest/collections/theforeman/foreman/foreman_callback.html#ansible-collections-theforeman-foreman-foreman-callback

Likewise, the documentation of the ansible plugin is outdated:
https://theforeman.org/plugins/foreman_ansible/2.x/index.html

To help me out I checked the source code of the callback plugin to figure out the parameters I need to use, how they work etc.

So my ansible configuration file is:

[defaults]
callbacks_enabled=foreman

[callback_foreman]
proxy_url = https://myserver.net:8443
url = https://myserver.net
report_type=proxy
client_cert=/etc/puppetlabs/puppet/ssl/certs/myserver.net.pem
client_key=/etc/puppetlabs/puppet/ssl/private_keys/myserver.net.pem
verify_certs=/etc/puppetlabs/puppet/ssl/certs/ca.pem

I have NOT generated these certs by myself, they are certs generated by puppet while installing foreman. The same certs are used in the foreman-proxy settings.yml file. It doesn’t matter in this context though, as I don’t have any ssl-related errors.

My simple ansible playbook:

---
- name: Test
  hosts: external_hosts
  gather_facts: no
  tasks:
    - name: setup
      ansible.builtin.setup:

Executing ansible with above settings:
ansible-playbook -i myinventory.ini ans1-only-setup.yaml

PLAY [Test] *******************************************************************************************************************************************************************

TASK [debug inventory hostname] ***********************************************************************************************************************************************
[WARNING]: Platform linux on host 10.76.4.34 is using the discovered Python interpreter at /usr/bin/python2.7, but future installation of another Python interpreter could
change the meaning of that path. See Interpreter Discovery — Ansible Core Documentation for more information.
ok: [10.76.4.34]

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

[WARNING]: Sending data to Foreman at https://myserver.net failed for 10.76.4.34: 404 Client Error: Not Found for url:
https://myserver.net:8443/reports/ansible

404?! Why it happens? Am I missing something? How it supposed to work? How can I gather facts from the hosts through smart proxy?

Expected outcome:
Ansible Foreman Callback plugin successfully reports facts to foreman through smart proxy.

Foreman and Proxy versions:
Foreman 3.13
Foreman Ansible collection 5.1.0

Distribution and version:
Alma Linux 9.4