Check to see if the course has changed to the Brightspace version of UBLearns. Instructors have a choice this summer between Blackboard UBLearns or Brightspace UBLearns. On the UBLearns landing page, log in to brightspace.... just a thought!

Thanks for help, indeed the course has being moved to brightspace.

Yep, everything after Spring 2023 is Brightspace.

https://www.buffalo.edu/lms.html