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.
I too would like to upvote this. I have spent the last few weeks trying to get the users presence API to work. In our case we only need to the read option to know if the user is in a meeting or not. It seems to me to be something so simple and obvious to offer. I hope this gets resolved soon.