I loaded up your save and could create any kingdom but Egypt. I created Mesopotamia, Khiva and Turkestan just to try it out, which worked fine. However, I couldn't create Egypt. I didn't have any issues in a new save from 2.4.3, though. Did you perhaps start the save in 2.4.2? I'm guessing there might have been something that went wrong with the title when loaded in 2.4.3 in that case.