Reading the documentation you have given me, I have seen that I was missing activating the communication server and copying the script in the Windows server folder.
/usr/share/ocsinventory-reports/ocsreports/tools# python3 install_plugin.py
Where is the plugins location [/usr/share/ocsinventory-reports/ocsreports/extensions/]
 => winserverfeatures
The server is installed on the same server ? [y]/n
Where is the server location [/etc/ocsinventory-server]
winserverfeatureshas been successfully installed ! Don't forget to restart your Apache server.
Now everything works correctly.