Originally published at: https://eduk8.me/2016/09/google-classroom-guardians-need-google-account-teacher-tech/
For Google Classroom Google account is required for guardian summaries. Guardians will need to associate their email with a Google account Source: Google Classroom: Guardians Who Need a Google Account – Teacher Tech I had totally forgotten that someone can have a Google account with their current email address and not use Gmail.