Cloudflare DNS - can't set root record

Thank you, you have pointed me to the right direction!!!
I use Cloudflare Pages, and in Custom DNS section I haven’t added the domain name without the ‘www.’ prefix:

The website you linked to is now showing green

Thank you for your help!

Excellent, my pleasure.

And yes, if you use Cloudflare for hosting, you need to make sure the domain is properly associated.