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seem the joomla user table got some missing parameter.
I need to check the database, could you please provide me cpanel access detail? I need to access your database manager.
and please make sure the super user login detail is valid.
please edit your first post at this topic and put any credential information at site info form (private)
sorry, I got your FTP & site access detail. but I cannot find hosting cpanel access detail.
better please send it to my email This email address is being protected from spambots. You need JavaScript enabled to view it.
please check it. I can login to joomla backend by using JCrew.
please login with that user and edit any users who complaining that cannot login.
please make sure that users has been assigned to joomla user group (registered, etc.)
and about new user registration, there is no issue with email activation: