facebook - Azure Web app - Could not resolve the hostname into a valid IP address -

i'm having problem using facebook object debugger ( https://developers.facebook.com/tools/debug/og/object/ ) scrape information page , i'm
getting error "could not resolve hostname valid ip address." can see bellow

this website hosted in azure, web app.

everything looks ok on domain registrar, have record pointing public ip , cname pointing xxx.azurewebsites.net.

you may want try removing record , redirecting root www.