Can't get domain mapping to work


I have the following:

1 x domain bought from bluehost

1 x domain bought from godaddy

I’ve pointed the nameservers to cloudfare but am managing them through my hosting account at rochen. This is where I use cPanel to add A/Cname records.

I created a subdomain install but when trying to map a domain to it, I get the red box message.

Please help.