ssh to local host with reserved domain

Hi,

I have the following config.yaml:

ssh:
 type: tcp
 region: us
 port: 21222
 to: localhost:22
 reserved_domain: xyz.mydomain.com
 plugins:
  ip_whitelist:
   - 127.0.0.1

For some reason the tunnel created is not pointing to a reserved domain, but instead us.loclx.io:21222.

Am I missing something? My intend is to point to my reserved domain host xyz.mydomain.com.

Thank you.