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

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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

facebook scrapping information

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.


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