Subdomain SSL Certificates

We have a server hosted with cacloud.com. We have been attempting to set up subdomains for clients to use to log in to one of our web applications. We have created the sub domains on cPanel, and installed the SSL certificate onto the server.

Past employees had properly set up the subdomains previously, but they have since left the company, and we have been unable to properly configure additional subdomains. When we created a new subdomain, and added in the correct redirect, it gives us a blank page with this message when trying to view that subdomain in a web browser:

Sorry, that account does not exist


For example,
bayshoreoptometry.visualbook.ca
is working as intended, while
orangeville.visualbook.ca
is not.

As far as we can tell, both subdomains have been created the same way on cPanel. The only thing we know, is that a senior member had to do something involving the SSL certificates for each subdomain.

Any information you can give us would be great, we are not very experienced in this area.