It sounds like there may be an issue with your login credentials. Sometimes issues can arise with autofilling and/or mobile devices because an extra space gets added accidentally to the beginning or end of the username of password, which then causes the login to fail. We recommend typing the login credentials and double-checking they are correct.
If the login is still not working, it could also be helpful for you to give the following a try. First try refreshing the page a few times to see if that helps. If not please clear your cache, and then log back in.
Note that the Academy site runs best on Chrome, Firefox, and Safari so if you are using a different browser, you might want to give one of these a try.