Cookies in multisite where network sites have their own domain name

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First Clear Browser Cache (including cookies) + server cache from cache plugins etc.

Then set the following in your wp-config.php file:

define('ADMIN_COOKIE_PATH', "https://wordpress.stackexchange.com/");
define('COOKIE_DOMAIN', '');
define('COOKIEPATH', '');
define('SITECOOKIEPATH', '');

Also, you may checkout the answer from HERE:

define('WP_ALLOW_MULTISITE', true);
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', false);
define('DOMAIN_CURRENT_SITE', 'your-domain.com');
define('PATH_CURRENT_SITE', "https://wordpress.stackexchange.com/");
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);
define('SUNRISE', 'on');

If it still fails, then read this answer or contact your server support, there may be a configuration issue in the server.

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