We make students inactive when they drop a class through our SIS system. At times our process for provisioning Canvas has a hiccup requiring me to manually activate the student in Canvas. We don't allow faculty to make a student inactive or active in Canvas.
It sounds like your students should still be active in your course as they are active in your Skyward system. If you go to People in Canvas and click the three-dot vertical ellipses to the right of your student's name there, you will see the ability to 're-activate' if you have the permission to do so. If you don't, contact your LMS administrator.
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