@Peter ******************
Next time I will submit as early as I can, 15 days before. This should give them a chance to process it. Going in person isn't a problem, and you have up to 7 days after the due date to do so. I wonder if it was a coincidence them rejecting after they had approved, or whether it was necessary in their system. As they don't give a reason and only tell you to go to the IO in the rejection email, I do not know.