@jwitulski - A TA role should use the Canvas Teacher app. Every out of the box role except Student and Observer can use the Canvas Teacher app. Keep in mind that admins can create custom roles to adjust some functionality for the user. For instance, they can create a TA that doesn't have grading permissions. They will be able to access the Canvas Teacher app but will get an error when trying to grade.
If you want the teacher assistant to grade, then the Canvas Teacher app is the only app they can use for this function.
If the teaching assistant just needs to look over course content (and not student submissions outside of anything public to all students (discussions, etc)), they can use the Canvas Student app.
My best advice is to talk with your Canvas support if the TA role is not working properly.
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