Shopify Subdomain Problem - 403 Forbidden Cloudflare

Hello,
I connected Shopify to a subdomain by configuring the CNAME record “shop.borgodus.it” and “www.shop.borgodus.it” to point to “shops.myshopify.com” (as explained in the official guide).

Everything works except for the URL “https://www.shop.borgodus.it”:

I set up a permanent redirect to https://shop.borgodus.it but with **https://www.**shop.borgodus.it it doesn’t work.

Could it be an SSL certificate problem?

In Cpanel status everything seems ok:

But if I check SSL certificate it reports an error: https://www.sslshopper.com/ssl-checker.html#hostname=https://www.shop.borgodus.it/

If I add “www.shop.borgodus.it” in third party domains the SSL pending tag comes out:

Thank you for your time,
Gioele