Give them Constantinopel if you hold it. Ai is fast tracked to always pillage capital. So often it will not peace out if you hold the enemy capital without a claim or core on it. Ai has become even worse with that mechanic im peacing out.
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The AI never peaces out without cry for peace before 99% in my experience
This is flat-out wrong. You need to occupy a fort "in the area" to demand Kosovo, but any one will do. It doesn't have to be the closest one, so Constantinople or Thessaloniki works as well. In the context, "area" doesn't mean state - it means anywhere within the same country that doesn't cross a country border or strait.Since this example is about Serbia take the following scenario: There's a fort in Zeta and you want Kosovo (everyone wants, or should want Kosovo). If you haven't capture the fort in Zeta you won't be able to peace out for Kosovo even with 90% warscore as you'll have a neg 1000 malus to the peace deal. Fortunately, the explanation for the red X on the peace deal will point this out to you.
I’d be interested to know from the OP did this work.As others have said, giving occupation control to Serbia could help as once they get get their cores back they should go for it. In fact giving all occupation to war leader is usually best.