Teams gives me a message "Only people with access to this org can join its meetings."

You are not logged in to Teams with your GCS Microsoft account. 

Click "Sign in."

Your GCS Microsoft credentials are:

Email: StudentID#@stu.gcsnc.com (Ex. 123456789@stu.gcsnc.com)

Password: Birthdate MMDDYYYY (Ex. 03282012)