Same database; different WordPress

You need to set the WP_SITEURL and WP_HOME in domainB.com’s wp-config.php file. Please add below code. 

define('WP_SITEURL', 'http://' . $_SERVER['HTTP_HOST']);
define('WP_HOME', 'http://' . $_SERVER['HTTP_HOST']);

In your server SSL setup then used below code 

define('WP_SITEURL', 'https://' . $_SERVER['HTTP_HOST']);
define('WP_HOME', 'https://' . $_SERVER['HTTP_HOST']);

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