Hello there, @markee ...
Sorry that your question has been sitting out here without a response for quite some time. Let's try to get your question resolved. First, everyone in your Canvas environment is first considered a "User". You add users either manually or via SIS import.
Once someone has been created as a "user" in Canvas, then you can enroll that person in a course as a "Teacher", "Student", "TA", etc. So, it is entirely possible that someone may be a "Teacher" in one course but taking a course as a "Student" in another course within your school's Canvas environment.
I hope this will be of help to you. Sing out if you have any other questions about this...thanks! Take care, stay safe, and be well.
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