If you create a class by importing from Google Classroom, we automatically create your students' accounts for them. You do not need to manually invite them to join your class too.
Students should log in using Google Single Sign On by clicking the "Login with Google" button on the login page.
The first time they log in, they will be prompted to create CommonLit passwords. This is because all students imported from Google Classroom have backup usernames and passwords, which you can access by going to your Manage Classes page and clicking the class name to go to Manage Students.