Error in network Site – Page daed

Hello Seniors,

i am facing difficult to run network site (multi-pal site) on single domain with below method subdomain.dommain.com with ssl, i was followed the below wordpress codex steps.and successfully update .htaccess with respective code:
`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]

and wp-config.php :

* For information on other constants that can be used for debugging,
* visit the Codex.
*
* @link https://codex.wordpress.org/Debugging_in_WordPress
*/
define( ‘WP_DEBUG’, false );

/* Multisite */
define( ‘WP_ALLOW_MULTISITE’, true );
define(‘MULTISITE’, true);
define(‘SUBDOMAIN_INSTALL’, true);
define(‘DOMAIN_CURRENT_SITE’, ‘insuranceinfo.co.in’);
define(‘PATH_CURRENT_SITE’, ‘/’);
define(‘SITE_ID_CURRENT_SITE’, 1);
define(‘BLOG_ID_CURRENT_SITE’, 1);

/* That’s all, stop editing! Happy blogging. */

After that i have successfully login wordpress a/c under Dashboard > My Site> have found
Primary Site also there is found a block and i had seen network site in the name “insurancenfo” after click the dashboard i am redirect to original site. when i am follow the next step Dashboard>My sites> Network Admin> click any option provided by wordpress Dashboard, sites, settings we are redirect to https://www.insuranceinfo.co.in/wp-admin/network/ and page is dead,

i have already created some sub-domains business.insuranceinfo.co.in, news.insuranceinfo.co.in under root directory.

Kindly assist how can i rectified the same.