One of my clients discovered this while heeding my general advice to actively manage things like the Lobby Announcement during the course of her event.
She had already pre-loaded all of her announcements into the Communications -> Lobby announcements area, and decided during her event that she wanted to enable three specific sessions at one point. Each had their own announcement.
She discovered the limit of active Lobby Announcements is two!
Here’s a sample of what you’ll see:
(more coming shortly)