If a subdomain is created in the control panel or in the DNS, it will not work immediately. Creating a subdomain results in a DNS change, which means it can take up to 4 hours before it works.

• If you already tried the subdomain in your browser before creating it, it will take the longest (up to 4 hours) before the subdomain works
• It's best to first create the subdomain and only access it for the first time after 10 minutes. There's a good chance it will then work immediately and you won't have to wait as long