My institution would like to use the "observer" role for giving mentors access to the course content, the coursework and grades of their students in all their courses. As far as I understand, this is exactly what the observer role is for. The observer guide explains that parents/mentors can sign up and link their accounts to a student, and that they can link further student accounts to their account. However, mentors in my institution can also be instructors in other courses, therefore their account already exists in Canvas. My question is whether admins can somehow link an existing account to student accounts as observer, and if so, how?