Today, the Username input is case sensitive. You cant write any letters with CAPITAL letters (even if they are with CAPITAL letters in Active Directory). F.eks: Jack has username jackjones. If he tries to log in with JACKJONES, he will get "Login Failed", but if he writes username as jackjones, it will work.
The Username field should not be case sensistive. This will spare IT Support for work and it will decrease most likely errors for the end user.
Thanks very much for taking the time to submit an idea to the portal. Unfortunately we won't be able to implement case insensitive usernames. For AD specifically, we are not in control of how usernames and passwords are validated. We pass the usernames as typed to AD and it is AD that determines if the user is authenticated. Even for local users, it is best practice to require an exact match for usernames.