You are enrolled in the course site as a student, but the instructor has not enabled access for students. The course is grayed out to show you that you are enrolled in the course, but can not access it.
In order to access the inactive course site, your instructor will have to publish the course. Once the course has been published, it will appear in your list of regular ICON courses. Note that some instructors do not choose to use an ICON site for their course, and may leave the course site inactive for students.
You can remind your instructor to activate the course site. Instructions for publishing a course can be found here.