If you are enrolled to a course but Cannot see it in your Canvas Dashboard, it may due to the Dashboard View setting.
From you Dashboard page, simply click at the 3 dots icon at the top right corner then change the Dashboard View to Card View.

To check on your enrolled courses, simply click on "Courses" tab on the left and then select "All Courses" or simply go to this url: https://miuonline.instructure.com/courses