Ah, there is some more info here. This is not a 404 error, the error is caused by a DNS lookup issue, here’s the fill message Chrome spits out:
The server at test.feelingpurpose.com can’t be found, because the DNS lookup failed. DNS is the network service that translates a website’s name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Google Chrome from accessing the network.
I have my money on the subdomain not being set up. In some cases I have seen a 10-30 minutes lag between setting up subdomains and them actually working. I’m not sure what the reason for this is, but it has happened.
While this still could be a WordPress issue it seems less likely, I would definitely wait to see what your host has to say. While you wait I would recommend taking a look at using FTP ?? It would allow you to see if the WordPress files are in the correct folder and so on.
Daniel