Hey everyone, I found this thread through having the same issue. But I appear to have solved it!
My sim is doing Lit&Lang degree and I was unable to give the final presentation, as it kept saying that the presentation board did not belong to my sim. However, I could still drag it into my inventory. So in order to fix the issue, go to any lot (I went to the Britchester quad) then pull out the useless presentation board. You won’t be able to put it back in your inventory so just leave it there. Then return home. And there should be a pop up that says the board has been returned to you. I was then able to give the final presentation!!!
Hope this works for you guys!
