Bro
UN mentioned 3 steps For the plebscite to take place in the valley
Pakistan was seen as an Aggressor at that time because it then illegally send its army and tribesmen in the valley
The first step, the withdrawal of Pakistan troops
The Second step was india reduced its tropps to the minimum level as prescribed by the UN
And the last step was the plebscite will be done in the presence of UN
PAkistan didn't Followed the first step so at that time plebiscite didn't happened
https://countercurrents.org/2019/02/why-un-supervised-referendum-couldnt-be-held-in
http://news.bbc.co.uk/2/hi/south_asia/1766582.stm