Ah! I know what caused this. The reminders were set for ‘two days before the end’. But then we introduced the concept of a due date which was later than the end date, and made the reminders based on offsets from the due date. The due date was then made two days after the end date, which pushed back all the reminders by two days.
I’ve fixed this. The reminders should now go out Thursday and then once more on Monday. Please let me know if the reminder timings work better for everyone this time around 
@mgmdi is from Edunext which is using Google’s email servers. I’d be surprised if these aren’t being delivered since so are we. @mgmdi have you checked your spam folder? If you see the emails there, could you let me know be sure to manually mark them as not spam? In any case, please message me on slack so I can help investigate further. If anyone else is having the issue, also please message me