When I go to finish the training for a slave(workforce,service,combat) it used to tell me what I need to get the specialty but now it's coming up blank.

Is there some trait I need for it to appear?

Seems like a bug. Do you use any mods

No, I had a blonde moment, I started some new games but kept going back and changing my character as I wasn't too far in. At some point I ticked the easy training option and didn't realize, that's why they are no longer showing up.

Thanks for taking the time to respond though, really appreciate it. No mods by the way.

So I started a new game and unchecked the easy training option and the prerequisite came up for that game, to prove to myself that was the issue. I thought that was it and went back to my old game and now they are showing on the old game again. Don't know if that's intended or not but I thought I should mention it.