Invitation to join a Group
The organiser (instructor) of the Groups will send an invitation to the students for them to join the group. As stated, it is not compulsory to join any group (including the quizzes group) and the student can reject the invite.
After the instructor has sent the invitation to the student, he/she will receive a notification like the below example for Jon:
After Jon has clicked on the notification, he will see the below screen and he can decide whether to accept or reject the invite.