Wanted to set up subdomain forwarding for my app custom domain through Azure. Note that I want a redirect, not DNS, and the only possible way to do this was through the &#39;Advanced Management Portal&#39; on the domain resource. Going to this portal, clicking my domain, and going to &#39;Manage DNS&#39;, then trying to add a subdomain to forward to another website, yields this error: There was an error processing your request. Please try again. If this issue continues, contact support. Domain lock was turned off. I have tried changing every possible setting for subdomain forwarding to no avail.