The HipChat <-> JIRA integration currently is limited to associating a specific room with a given issue. If you're looking for a general list of users, that is only available from within the HipChat client itself.
If you're running the desktop app it should be very quick to switch over and open a chat with a given person (you can CMD-TAB to the app and use CMD-N to quickly open a chat with a user.
...from the beginning. We have built up a lot of content in HipChat, with it being a core tool in our distributed company model. While it is true that we didn’t need to move to Slack immediately, we felt it...
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