Currently only delegated user permissions are supported, and this is very sub-optimal for bots and service applications that need to monitor Teams presence of users.
Upvoting as well. We have two main use-cases; a helpdesk-only app that integrates into a number of different platforms, and an internal directory where viewing of Lync / SfB presence information has been integrated for at least the last 8 years.
It's things like this that give our teams deployment a bad rep with internal users; a reduction in feature-set and capability.