I currently have Birthright and I'm trying to recruit other people's units in their castle. I want the Nohr siblings. I've beaten other castles from Nohr games using no handicaps and in my castle, but I still can't recruit units. I also seized their castle as well.
After beating them, I get the message "Would you like to add a character to your log book" and that's it. I've heard it should say "would you like to recruit?" Am I doing something wrong? And what should I do to get the Nohr siblings recruited in my game?