First, users will want to check the Filters for that Attendance Manager:

  1. Go to Core > Security > Roles
  2. Click Attendance Manager
  3. Click Members
  4. Select Filter for the affected Attendance Manager
  5. Verify the appropriate Group Types and School Levels are marked for that user

Next, users will want to check the Access Dates for the Schedule Sets: 
  1. Go to Academics
  2. Go to Scheduling > Scheduling outline>  Schedule Sets
  3. Edit the preferred Schedule Set
  4. Verify the date set in Access Date for Attendance Manager is set to either a past date or current date.