Good morning, @AlexKelman ...
Each school that uses Canvas as their LMS (Learning Management System) has their own way of signing in to Canvas...so the process at your school may be very different than the process at another school. You mentioned that you have talked with your tutor, but I would actually suggest you reach out to your school's Online Learning / eLearning / Distance Education department to help troubleshoot this issue further. Or, if you know who your school's Canvas administrator is (this person might be in one of the departments I've listed already), that would be a good resource for you, too. Hopefully someone at your school will be able to work with you to get this resolved for you soon. Good luck!