Currently not possible to restrict a user from seeing specific categories on the ‘Teams” side of the integration. For example, Users should only be able to see the categories they have access to on the Teams side of integration.
@srmnrth You are right. Part of integration requirements was alignment with the service desk permissions, so this is a bug. Thank you for pointing it out. We are on it, but please open a ticket to our support team so it will be properly recorded and when the issue is resolved, you will be informed.