title: Can't verify domain ownership azure website to add subdomain
body: <p>I followed this tutorial to add a custom domain on my Azure Website <a href="https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain#cname" rel="noreferrer">https://docs.microsoft.com/en-us/azure/app-service/app-service-web-tutorial-custom-domain#cname</a> and I can navigate successfully to root domain, my problem is that I want to add a subdomain (www) but at least step I receive next notification:</p>
  
  <p><a href="https://i.stack.imgur.com/M3C1q.png" rel="noreferrer"><img src="https://i.stack.imgur.com/M3C1q.png" alt="Error on Azure"></a></p>
  
  <p>the error is clear that I need to add the CNAME record to point to azure website, the major problem is already added on cloudflare:</p>
  
  <p><a href="https://i.stack.imgur.com/CcfYV.png" rel="noreferrer"><img src="https://i.stack.imgur.com/CcfYV.png" alt="Configuration on Azure"></a></p>
  
  <p>I have something wrong with my configuration?</p>