User trying to login in user area or install the sofware?You can see on first picture, the system generated user and pass and sent to email to user, user try to login with error, i tested user and pass and works on zenno panel login, sale is created all is fine
Dear @aleksa77 ,@VladZen and you see point, you are moderator and you are confused, users are more confused when they want to add username on first time, they try with email but need to add username