If you are a new user that is in the process of creating your account and are using Clever, ClassLink or Google Classroom for rostering, you may notice that the initial classroom sync screen only allows for 1 classroom to be synced. If you need to sync more than 1 classroom, please do the following:
Select one classroom to sync and then proceed with the rest of the setup process.
When the setup process is complete, navigate to the "Classroom Settings" tab. Click on one of the buttons on the right hand side that corresponds with the rostering method that you are using. This will allow for you to sync up the remaining classrooms that you need to sync.