First of we support only WP Multisite on Apache server (not Nginx server). You’ll need to update the htaccess file manually. You’ll need to follow these steps:
– goto HMWP >> Start Tab >> select ‘Medium Privacy – More Compatibility’ scheme >> click ‘Save Settings’
– goto HMWP >> Start Tab >> click ‘Multi-site Configuration’
– now use a FTP program or your host file manager and add those lines to your htaccess file (after RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ [-])