Forward Subdomain to URL

The target field is not for URLs. It is for hostnames. A CNAME record creates an alias of a canonical hostname.

You can think of Bill Smith as an alias of the canonical name William Smith. They are different names that refer to the same person. That’s how a CNAME record works. It’s just another name. It is not a redirect. It also only works if the canonical name knows about the alias. If William doesn’t know he is supposed to answer to Bill, the alis isn’t very useful.

If your goal is to make a hostname lead to a particular page or path below another hostname, you will need to use a redirect. Try some of these examples.