The post above about .htaccess code and Cloudflare IPs, which was part of the article
is no longer possible to apply here on hosting.
The admin and I discovered “something” that led to recent changes on the servers.
Because of those changes, now there is no need to retrieve the CF-Connecting-IP (visitor IP) through a PHP script,
now the server does it by itself !
But for that reason, the specified .htaccess code can’t see anymore the Cloudflare server’s IPs - it sees the visitor IP
and if it compares it with the existing IP list → of course it will return 403.
I deleted that part from the article and an alternative solution was added
and I hereby thank the admin for that.