This domain previously used Cloudflare. Such a “ban” is typically due to an outstanding bill from the previous usage… but it could also be a technical issue.
As you’ve opened a support ticket already, please wait to hear from the Cloudflare support staff. The community support forums can’t help with account and billing issues.
NB: If previously had this domain with Cloudflare, then check to see if there are any unsettled bills and pay them. If you’re new owner of the domain, then just wait to hear from support.