Have the accounts in question fulfilled the emailconfirmed requirement? That is, have they gone through the procedure that verifies that their ownership of their email addresses? If you want a group for every user who's logged in, MediaWiki comes with one called 'user'.
I need more complex user rights system , autopromote isn't working with all conditions ( APCOND_EMAILCONFIRMED,APCOND_EDITCOUNT, APCOND_AGE, APCOND_INGROUPS) email validation is disabled so APCOND_EMAILCONFIRMED should be always true.