WP Multisite subdomain based not working

I have set up WP Multisite based on sub-domain(not sub-directory). Everything working fine but when creating a new site it's not showing at the frontend, just showing "OpenLiteSpeed is functioning normally". I have set up domain mapping, using DirectAdmin as cPanel and OpenLiteSpeed as a server. I have followed the DirectAdmin documentation but still no luck. https://docs.directadmin.com/webservices/apache/customizing.html#wildcard-domain-com I think something wrong anywhere and it's a quick job for an expert.