Don't feel silly. If I hadn't read the bulletin that popped up the other day I wouldn't have known to check for Obiseks message in my journal, but I'm sure a lot of folks didn't catch that part. I know it's more fitting with the story for this part, but after every other part came from T'Nae, I can see why it might cause some confusion.
I'm kinda suprised that they didn't have a message waiting with T'nae or something at least telling you to contact Obisek. I'd have wondered myself if I had not started looking for the mission in remote contacts and noticed Obisek on the list.