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.
We have a chat app where we want to display our internal employees Team status to our customers. This would let the customer know if the employee is available to chat. Currently, we have our employees manually set a status which gets displayed in the chat app. We also have a Teams bot setup that sends a Teams message to the employee when the customer wants to chat.
The application permission for get presence would allow us to use their Teams status in our custom chat app which would greatly simplify things.