login to all subdomains by login in one subdomain wordpress multisite

I have installed a wordpress multisite with subdomains, it has installe d properly and working fine, Now I want to share users among the subdomains so that users are not needed to register for every site separatley, and i want if a user login in one subdomain , and visits other subdomains for the same multisite, he should not be asked to login again,
To share users, i installed a plugin “join my multisite” , with this users are shared among all subdomains, and for login issue, i am unable to solve that , while searching on google i found , to make some changes in config file like this

define(‘COOKIE_DOMAIN’, ‘.domain.com’);
define(‘COOKIEPATH’, ‘/’);
define(‘COOKIEHASH’, md5(‘domain.com’)); // without preceeding dot

but it is not working, how can i solve the problem

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