Empty Assignement Key prevents course completion
This is about the course at https://academy.pega.com/library/83/system-architect-essentials-exercise-update ("System Architect Essentials Exercise Update (version 8.3)").
Section "6. User Interface: Exercise" doesn't come up in the browser (is skipped during the "Continue to the next lesson" transition, and presents an "Empty Assignment Key" message when clicked directly in the course overview -- see attached), and doesn't allow the course to be marked as completed.
NB: The section can be still followed using the PDF guide for the course.