We have a vendor hosting a website for us on their domain, and I want to add a redirect(alias) to it in our DNS. Let's assume the vendors domain is vendor.com, and or domain is domain.com. The website is askdomain.vendor.com, and I wanted to do a redirect from ask.domain.com. I made a cname record that points ask.domain.com to askdomain.vendor.com, but it's not working. Am I missing a key point of CNAME redirects?