On Forced Peace

[KaiserJohan]

You need +10 warscore to be able to make demands already
The reason I could annex Thrace was because he wasn't warleader and my warscore (as Phrygia) vs his nation alone was 100%.
FYI Battles are capped at 25 warscore.

 

[KaiserJohan]

Forced whitepeace does not require 10+ warscore, only to force annex a claimed province.
The warscore has to tick up to +25 before the roughly-three-year timer begins, so in practice it's more like 5+ years, if you control the wargoal completely from the start