From the Collaborate Manager view, you can see the default “Course Room” session. This is the default session, and is set up in every Blackboard course or organization. On occasions, a teacher may choose to “Lock” the session.
The Lock setting is set by the teacher. The most common reason for this is either:
As noted, this is not a “tech issue” but a setting chosen by the teacher. You will need to contact your teacher to find out what you are expected to do.