First, you will want to check the Filters for that Attendance Manager, to do this:
  1. Go to > Core > Users/Access > Profile > Manage Roles
  2. Select Attendance Manager
  3. Click Members
  4. Select Filters for that Attendance Manager
You will want to make sure the appropriate Group Types and School Levels are marked for that user.

Next, you will want to check the Access Dates for the Schedule Sets, to do this:
  1. Go into > onRecord > Settings > Schedule Sets
  2. Edit the Schedule Set
  3. Verify date set in Access Date for Attendance Manager
You will want to make sure this is a current or past date, otherwise they will not be able to see Section Attendance.