Website not opening from www

My site is connected to Cloudflare.
The DNS settings say:

A mysite.com IP_Server
A www IP_Server

I would not like to publish the domain in the public domain.
I entered it on sitemeer.com
Time on sitemeer.com 19:53.
The problem is this:
When I enter site.com in the address bar, the site opens correctly.
When I enter www.site.com, I get a 403 error.
The server administrator says that the problem is on the Cloudflare side. The server administrator has no logs of visiting www.site.com
Please help!

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