You may have missed the directory of the software "/app/login". So for example, if your CNAME or Whitelabel domain is app.mydomain.co, you should enter app.mydomain.co/app/login instead. In saying all these, you must already have followed the correct procedures in setting up the CNAME/Whitelabel domain. Here's the tutorial video: http://link.mylocalagency.co/cr-cname