I'm having a weird issue here and I don't know how to fix it. So, using User plugin I I created an account from the backend. The account is enabled since I check the database and is_activated is set to 1 and also I enabled from backend (BTW: in users administration I have not seen it anywhere something about if the user is active or not, would be good to add a column showing such information as reference for administrators). Then, having this information I made the following tests:

• Tried to login using email/password: no success with error "A user was not found with the given credentials." on line 185 of /var/www/html/alomicuba/vendor/october/rain/src/Auth/Manager.php" (also will be nice if we can customize this message since that for common users is ugly)
• Change the field type from email to text to allow non email strings at login form and tried to login using username/password: no success with error "Not a valid email"

Did I miss something here?

I've only tested this a little bit, but I always had my "email" (under details tab) and "login" (under account tab) the same... then it seemed to work (ie, i logged in w/ and email, not a text string).