Why do I get an error message when trying to sign in even though I know my password?

If you are trying to sign in to a Teacher or Student account, or a School account that is part of a larger District account, you need to enter the Group Username in addition to your personal Username and Password.

 

In the example below, Ben Parker is a student at Big Universe School. He needs to enter both his username, bparker, and his group username, buschool, in order to log in. 

Error Message at Sign-in