Hi Selin,
I can see others have been running into some issues
The company behind the development of the LTI integration is Blindside Networks. I know it would take some effort to test and ensure that LTI 1.3 works with Blackboard.
If there is an option to engage their time for help, you can reach out to them, and or companies that support BigBlueButton, at
All of these companies are involved in the core development of BigBlueButton and earn their revenues by providing hosting, support, and engineering services. We may include testing of Blackboard in future updates, but if time is of the essence, definitely reach out.
Regards,... Fred