When logging into your ArcOnline account (and I assume Enterprise accounts have the same problem), a lot of users struggle to enter their Password correctly the first (second and third) time as it only shows the most recent leter you've pressed. Many login functions have a check-box to "Show Password" so you can review it in full before hitting submit. Whilst on a PC or larger device, typing is relatively easy, mobile devices can be more difficult, especially for less tech savvy users with "fat finger syndrome".
