In my multisite, new sites cannot be accessed. Using Subdomain type. Anyone have a solution?

In my multisite, new sites cannot be accessed. Using Subdomain type. Anyone have a solution?

domain: insteb.com
child site: test.insteb.com
*.insteb.com already set to /public_html

.htaccess is as below:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^wp-admin$ wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^(wp-(content|admin|includes).*) $1 [L]
RewriteRule ^(.*\.php)$ $1 [L]
RewriteRule . index.php [L]