Teachers can be assigned permissions on the Portal Groups Security page. 

If the Supplemental Attendance Program option of Allow Walk-Ins is on, please allow the following permissions:

• Insert to Supplemental Attendance Student Assignments (ATA) 
• Read, Update, Insert, Delete to Supplemental Attendance Data (ATD) 
• View All Students In Current School security permission.

For Teachers to be able to access and run the Supplemental Attendance Class Roster report they need Read permissions to all of the Supplemental Attendance tables in security.