@kmeeusen , I cannot concur with part of your advice "I would suggest you simply skip that day's lesson plan and not use Canvas at all."
I find it totally believable that a school would not add a substitute teacher to a Canvas course. Reasonable is a different situation, but totally believable. What I remember about substitute teachers is that they were often called in at the last moment with little time to prepare. A Canvas Admin would probably not be bothered with a list of who was substituting that day and even if they were, that's a lot of work to put on them each morning. So I find it totally believable.
Way back when I was in school, the substitutes often had no experience in the subject of the course, were little more than babysitters, and it was a lost day as far as content went. I want to think it has improved, and @j_e_riley 's concern indicates that he wants to do the right thing.
You are correct that this is something that this is something that needs addressed with the local school district. If there were a group of regular substitutes, the school may want to add them to the course using a TA role or with a customized role. They would possibly need added to several courses -- again a big hassle for the admin. I would remove the ability to edit and view grade data. This lesson in the Canvas Admin Guide provides additional information: https://community.canvaslms.com/docs/DOC-12636-421473660
An instructor might take exception to letting others have access to their courses, especially if they don't miss many days. Looking over their shoulders at the student Chromebooks may be as good as it gets.
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