Sharing session between wildcard subdomain

Hi everyone, I'm in troublesome situation and can't figure out how to solve:

I'm creating a localhost project and using wildcard subdomains to change between languages: localhost:4001 for main language and subdomain en.localhost:4001 for English and fr.localhost:4001 for French. 

Everything work OK but when I login using AAuth, it not work on subdomains but on localhost:4001 only. I tried another session function and recognized all function using session not work.

Here is my config, I'm using CI 3.1.2:

$config['encryption_key'] = 'k5ogwL4ThZ5TpSsnUjveUp9gLaoFqbLX';

$config['sess_driver'] = 'database';
$config['sess_cookie_name'] = 'tcms_cookie';
$config['sess_expiration'] = 0;
$config['sess_save_path'] = 'ci_sessions';
$config['sess_match_ip'] = FALSE;
$config['sess_time_to_update'] = 300;
$config['sess_regenerate_destroy'] = FALSE;

$config['cookie_prefix'] = 'tcms_';
$config['cookie_domain'] = '.localhost:4001' ;
$config['cookie_path'] = '/';
$config['cookie_secure'] = FALSE;
$config['cookie_httponly'] = FALSE;

$config['csrf_protection'] = FALSE;
$config['csrf_token_name'] = 'csrf_test_name';
$config['csrf_cookie_name'] = 'csrf_cookie_name';
$config['csrf_expire'] = 7200;
$config['csrf_regenerate'] = TRUE;
$config['csrf_exclude_uris'] = array();

So please give me any suggestion how to fix it. I will appreciate for your help.