TFS Kanban board not visible for some users

We have TFS 2012 and some users can see the Kanban board while other users cannot see Kanban board or (WorkàBacklogs). We compared the permission under administrator settings and seems to be same for all users (developers group). Is there any special permission or server side permission you have to assign to see Kanban or backlogs tab?

Any guidance or instructions would be helpful.

Thanks,