In order to access Google Classroom from home, students must be added as a user to the home Google Chrome account using their school mymail.lausd.net account and password.
You must be signed into Google Chrome under the STUDENT'S mymail.lausd.net account!
(In other words, you cannot be logged in under a parent account and simply type in the student's mymail and password to gain access.)
If the student is not already listed as a user, you will need to "ADD" the student as a user when logged into Google Chrome. Press your own user icon, and there is a + button on the drop down menu to add another user.