cant figure out how to play CO-OP in Halo:MCC on xbox gamepass (PC)

[Dan]

I signed up for the game pass and downloaded halo... I dont see a single place to play coop? I dont care if its split screen/lan/xbox. Ill sign up for another account for my sons PC. Its only Online 4v4 or Firesquad (halo reach unlimted wave things) I want story coop. What am i missing?
Xbox game store using Xbox live pass $1/mo currently on PC.

 

[Armenius]

Just assemble your party and then select campaign, not multiplayer. Party options are on the top-right of the screen.