I have a custom domain. I've changed the DNS and everything is pointing just fine. When I go to my custom domain, I'm linked to Adobe Portfolio's "missing" page. This tells me that my DNS settings are correct.
When I try to imput my custom domain into Adobe Portfolio, I get an error: Oops! Looks like you missed a line! Please go back to your domain settings and add an "A record" for your root domain (markadamsdesign.com). Instructions here. (Check your DNS status here)