Welcome to the Make community!
Looks like the Canvas modules have not been fully developed yet. Or, you should select the course without mapping the ID there (turn off the map toggle).
Otherwise, you will need to use Get an Assignment to get the Assignment ID first. If you do not know the Assignment ID, you can use the Search Assignments module.
Hope this helps! If you are still having trouble, please provide more details.
— @samliew
P.S.: investing some effort into the tutorials in the Make Academy will save you lots of time and frustration using Make!