We're in the process of storing custom user data in Canvas using the API to support an LTI that needs data we can't otherwise display to them (user's home campus.)

https://canvas.instructure.com/doc/api/users.html#method.custom_data.set_data

Since the data will already be in there, I'd like to be able to allow teachers/campus administrators to see a given user's home campus. I've managed to successfully inject the data into a page using custom javascript but right now it look like only account admins can retrieve the data. Everybody else gets a 401 error.

Does anybody know more about the permissions required for custom data or has anybody implemented something similar?