Enabled this, but when visiting website over https have error. "You attempted to reach YYYY, but instead you actually reached a server identifying itself as ssl2000.cloudflare.com. This may be caused by a misconfiguration on the server or by something more serious. An attacker on your network could be trying to get you to visit a fake (and potentially harmful) version of YYYY."
Looks like things are still in progress and does not work out of the box. Will see what will be in a day or couple.
We are in the process of issuing 2 million certs. Your cert hasn't been issued yet so you are hitting a sort of 'default cert'. Once that error goes away you are set.