OK, I'm playing as duke of Silesia(Poland), after conquering duchies all around (Poznan, Mazovia, Pomerania and few others) I pressed Poland for independence and won. Now I have an icon saying I can usurp the title for Kingdom of Poland (I have both the money, and 62% of the required 50% of its counties) but while I was able to create/usurp duchies before, in this case, the button stays greyed out. I think it has something to do with the fact that despite of being independent I'm still just a duke, but given the fact I have over 1,5k prestige compared to 1k of Poland's king, why can't I usurp that title, on even better ask Pope or HRE emperor to make me a king (of my own lands) huh?
