Client has no logins

I’m working with a client that has no logins whatsoever for their website, but the domain is listed as being registered with CloudFlare. Can anyone advise how I’d go about gaining entry to it?

I can prove ownership of business in question.

Try emailing: support AT cloudflare DOT com

You can also try looking at that WHOIS listing because it has a contact link for a registered domain so you can send a message to the owner. Then maybe the message will pop up somewhere.