SOLUTION TO NOT RECEIVING WEEKLY REPORTS
Login to your school Duolingo account.
Click the class in which you wish to have a report.
Click "More Details", near the top next to the "Invite Students" Button.
You'll see 2 options, click "Activities Detail".
To get the information about the last week click, "Past Week" or "Pick a date range"
You'll then see for each of your students, "Days Active", "Lesson", "Course Progress", and "Points Earned" for whatever time period you've selected.
- You may download in a .csv format the report as you see it by clicking "Spreadsheet".
As far as how to receive the report again that we all know and love, I have no idea how to fix that, and, from my research, apparently no one else does either.
DISCLAIMER: Since websites have a tendency to change overtime it's quite possible in the future, maybe when we really have jetpacks, this method won't work. Please keep that in mind. Today is 9-18-19 or September the 18th, 2019