I want to visit my store using www.rblx-store.com but it’s only giving that Verification of Contact Information page, and I don’t know what to do. I even purchased a SSL certificate on netcup where the domain is purchased from and now I have that and don’t know what to do with it. the https://rblx-store.com/ URL works fine and I want the www. one to work just like that.
Welcome to the Cloudflare Community. 
I just saw this happen two days ago on another domain using the same registrar that you are using. It turned out to be the wrong IP address had been entered in the DNS. Here is a link to that topic, in case it helps.
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That could very likely be the problem, but how do I find out what ipv4 I have to put into the www record?
What IP does your webhost tell you the server uses? It’s probably the same one that is in the name that is working.
I am using Sellix.io and their support at times is a bit… special
I am still waiting on a response from them regarding what to put as the IP, for now I just redirect the www to the https one
That appears to have done the trick.