Blackboard Collaborate Ultra: User limit
Session attendance limits are enforced to ensure a positive user experience. A total of 250 participants can attend a Blackboard Collaborate Ultra session at the same time.
This document explains the total of participants that can join a Blackboard Collaborate Ultra session.
If users attempt to join a session that is full, they will see a message that reads, "Uh oh! This session is full." and will have to try again later. The individual will not be able to join unless another exits the session.