Have tried to submitted 3 times, awaiting all agents finished tasks and output the report content, the page always show undone status.Not sure if there’s any button to confirm done, next lesson does NOT work. 
Hello @rootchina , welcome!
Can you download the report?
Also, is it the “Next Lesson” button in the bottom right corner that’s not working, or are you unable to open Module 2 by clicking “Course Syllabus” in the top left corner as well?
can you share screenshot of what you are stating once?
Also make sure to clear off any cache and browsing history once, before you try again.
Remember even instructor mentions agents might take a little time create the report, so wait for a while for final report to be created like how @Anna_Kay shared her report.