Two students have not received the email from Canvas to join the course. The course is Published and Canvas says the email has been sent, but students have not received it. I am the instructor. Yes, we have checked their spam and trash folders. For their login, it gives me a very long number (21 digits long) whereas my other students all use their school email addresses for their login (or log in with Google). How can the students receive the invitation to join the course? Is there a way to change the student login from the number to their email address (I'm assuming Account > Settings).