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.
With the lack of forward motion on this, we've essentially given up on using Teams presence.
It's more effective and reliable, in fact, for our own application to maintain a presence state, and for it to write through and set a user's Teams presence, since there does exist the Application-level Presence.ReadWrite.All permission scope.
It baffles me that this many years on, such basic functionality for Teams with regards to a developer SDK are unimplemented.