TWP on JR Keihintohoku Line-Nigeshi Line?

Hi there, I am going to Tokyo this coming December 2018. I plan to use Tokyo Wide Pass while I'm there. One of the many routes I'll be using is JR Keihintohoku Line-Nigeshi Line Rapid from Oimachi (JK19) to Ueno (JK30). Is Tokyo Wide Pass valid on this line? Thank you

A JR East pass is valid on JR East lines. Those stations are well within the three day pass area.
Look at the page/map for all the information you should need for the pass and it's coverage.
https://www.jreast.co.jp/e/tokyowidepass/

That section is covered by that pass,
but no "Negishi(NOT "Nigeshi") line" signs in this section, be careful.
http://www.jreast.co.jp/e/stations/e307.html
http://photozou.jp/photo/show/2436427/248443833
https://youtu.be/Jw_X7yw7kV0

JR Negishi line is not located in Tokyo, far from JR Yokohama station,
but same water-blue colors cars are using mostly as direct through service train.
https://en.wikipedia.org/wiki/Negishi_Line
Watch 54:10 to 1:18:05,
first part 0:00 to 32:35 is Negishi line,
you able to notice train announcement calling line name changed at 33:40.
https://youtu.be/5Vo4u4AmXVY